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• sub
  sub

  noun

  a submarine.
• SUB
  SUB

  abbreviation

  supplemental unemployment benefits.
• sub-
  sub-

  a prefix occurring originally in loanwords from Latin (subject; subtract; subvert; subsidy ); on this model, freely attached to elements of any origin and used with the meaning “under,” “below,” “beneath” (subalpine; substratum ), “slightly,” “imperfectly,” “nearly” (subcolumnar; subtropical ), “secondary,” “subordinate” (subcommittee; subplot ).
• sub.
  sub.

  abbreviation

  subordinated.
• sub–
  sub–

  A prefix that means “underneath or lower” (as in subsoil), “a subordinate or secondary part of something else” (as in subphylum.), or “less than completely” (as in subtropical.)

sub

¹ American  

[suhb] / sʌb /

noun

subs plural

1. a submarine.

2. a substitute.

   We've got a sub in English this week because our teacher's home with the flu.

3. a submarine sandwich.

4. a submissive in a BDSM sexual encounter or relationship.

5. a subcontractor.

6. a sublieutenant.

7. a subordinate.

8. a subaltern.

9. British. an advance against one's wages, especially one granted as a subsistence allowance.

10. Photography. a substratum.

11. a subscriber.

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verb (used without object)

subs, present (3rd person singular) subbed, past participle, past subbing present participle

1. to act as a substitute for another.

2. to act as the submissive partner in a BDSM sexual encounter or relationship.

verb (used with object)

subs, present (3rd person singular) subbed, past participle, past subbing present participle

1. Photography. to coat (a film or plate) with a substratum.

SUB ² American  

abbreviation

1. supplemental unemployment benefits.

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sub- ³ American  

1. a prefix occurring originally in loanwords from Latin (subject; subtract; subvert; subsidy ); on this model, freely attached to elements of any origin and used with the meaning “under,” “below,” “beneath” (subalpine; substratum ), “slightly,” “imperfectly,” “nearly” (subcolumnar; subtropical ), “secondary,” “subordinate” (subcommittee; subplot ).

2. Chemistry.

   1. a prefix indicating a basic compound.

      subacetate; subcarbonate; subnitrate.

   2. a prefix indicating that the element is present in a relatively small proportion, i.e., in a low oxidation state.

      subchloride; suboxide.

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sub. ⁴ American  

abbreviation

1. subordinated.

2. subscription.

3. substitute.

4. suburb.

5. suburban.

6. subway.

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sub- ¹ British  

prefix

1. situated under or beneath

   subterranean

2. secondary in rank; subordinate

   subeditor

3. falling short of; less than or imperfectly

   subarctic

   subhuman

4. forming a subdivision or subordinate part of a whole

   subcommittee

5. 1. indicating that a compound contains a relatively small proportion of a specified element

      suboxide

   2. indicating that a salt is basic salt

      subacetate

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sub ² British  

/ sʌb /

noun

1. short for several words beginning with sub- See subaltern subeditor submarine subordinate subscription substandard substitute substratum

2. Formal term: subsistence allowance.  informal an advance payment of wages or salary

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verb

1. (intr) to serve as a substitute

2. informal (intr) to act as a substitute (for)

3. informal to grant or receive (an advance payment of wages or salary)

4. informal (tr) short for subedit

5. (tr) photog to apply a substratum to (a film or plate base)

sub. ³ British  

abbreviation

1. subeditor

2. subito (in music)

3. subscription

4. substitute

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sub– Scientific  

1. A prefix that means “underneath or lower” (as in subsoil), “a subordinate or secondary part of something else” (as in subphylum.), or “less than completely” (as in subtropical.)

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Regionalisms

See hero sandwich.

Other Word Forms

Inflected Forms

Nouns

• subs
  plural

Participles

• subbing
  present
• subbed
  past

Conjugated Forms

Present

• sub
  simple
• subs
  simple
• have subbed
  perfect
• has subbed
  perfect
• am subbing
  progressive
• are subbing
  progressive
• is subbing
  progressive
• have been subbing
  perfect progressive
• has been subbing
  perfect progressive

Past

• subbed
  simple
• had subbed
  perfect
• was subbing
  progressive
• were subbing
  progressive
• had been subbing
  perfect progressive

Future

• will sub
  simple
• will have subbed
  perfect
• will be subbing
  progressive
• will have been subbing
  perfect progressive

Etymology

Origin of sub¹

By shortening of words prefixed with sub-

Origin of sub-³

< Latin, combining form representing sub (preposition); akin to Greek hypó; see hypo-

Explanation

If a history buff mentions a sub, she's probably referring to an underwater warship. But if your friend wants a sub for lunch, he hasn't suddenly developed a taste for warships — he just wants a sandwich. Sub is short for submarine, the cylindrical watercraft with rounded ends that can operate deep beneath the water. Sub can also refer to a long sandwich filled with meat, cheese, and veggies; this kind of sub goes by different names in different parts of the country, including hero, hoagie, and grinder. The sub in your geometry classroom is probably just a substitute teacher.

Example Sentences

See Examples For:

sub SUB sub- sub. subs subbed subbing

Quantum mechanics is the branch of physics that explains how matter and energy behave at the atomic and sub atomic scale.

From Science Daily ● Jul. 13, 2026

During the 13-week quarter that ended June 28, that growth stood at 2.3%, the company said, with its popular limited-time chicken salad sub and digital marketing efforts driving the gains.

From MarketWatch ● Jul. 2, 2026

The Kim regime could also be expanding uranium enrichment in anticipation of needing new supplies for a nuclear sub North Korea has under development, said Hailey Wingo, a co-author of the Vertic analysis.

From The Wall Street Journal ● Jun. 10, 2026

The sub took up to three people on the dives, collecting the fossil samples using robotic arms.

From Barron's ● Jun. 10, 2026

It became obvious to many on the small sub that Quirin and Heinck had formed an alliance that excluded Dasch and Burger.

From Nazi Saboteurs by Samantha Seiple

Emma Davis helps to run The SUB Lisburn, which opened its doors to parents looking cheaper uniforms in 2021.

From BBC ● Aug. 28, 2023

When they rejoined the sit-in strikers, “maybe 4:30 or 5 p.m., local police officers came in with a restraining order to have the SUB evacuated,” she said.

From Washington Times ● May 16, 2020

The reality was that he and Darcy didn’t have much cushion, and his SUB pay was about to be cut in half, and his GM health benefits were going to run out.

From Washington Post ● Apr. 15, 2017

“FUM” is a slang term for F&M;, and SUB stands for “Student Union Board.”

From Washington Times ● Jul. 4, 2015

Thus they, in two long rows, 30,000 of them by the tale, dine joyfully SUB DIO.

From History of Friedrich II of Prussia — Volume 07 by Carlyle, Thomas

Due to its unusual climate, the island is rich in biodiversity, serving as a breeding site for southern elephant and sub- Antarctic fur seals.

From BBC ● Feb. 12, 2025

Eris “is essentially a sub-, sub-variant of XBB,” according to Pan.

From Los Angeles Times ● Aug. 10, 2023

He didn’t stand out in the second half of the season, as Seattle fell from 6-3 to 7-8 before winning the final two games of the regular season, dropping games to the sub-.

From Seattle Times ● Mar. 6, 2023

Cincinnati does have a very, very long-shot chance for the bye: They would have to beat the Browns and have both Kansas City and Tennessee lose to sub- .500 opponents.

From New York Times ● Jan. 4, 2022

Other familiar songs to help increase verbal awareness include songs with word sub- stitutions or nonsense syllables such as Sarasponda or Supercalifragilisticexpialidocous.

From "Music and the Child" by Natalie Sarrazin

"For Deniz it was clear, he gave us a lot in the last game when he was a sub. Deniz doesn't need to be prepared, he can jump in right away."

From BBC ● Jun. 21, 2026

A quick run-down: I adore sunchokes but they're notoriously difficult to find at most stores, so if you need to sub. this out for anything, I'd opt for any other root vegetable.

From Salon ● May 14, 2023

Unperplexed by all the hubbub, Said he: “It’s the guy from Grubhub, Bringing me my favorite pub sub. Just a sandwich, nothing more.”

From Washington Post ● Aug. 8, 2019

“I want to see the difference in a nuclear-powered sub. For me, it’ll be like going on a Carnival Cruise ship,” he said.

From Washington Times ● Sep. 29, 2014

“Since this is the first run, we want to go easy on the sub. We’ll head out from shore and go twenty feet down, make a circle and come back.”

From "Wolfie & Fly" by Cary Fagan

Philly Cheesesteaks, along with new hot Italian subs, have proven popular among younger consumers.

From MarketWatch ● Jul. 30, 2026

White then subs Clark out for Raven Johnson, having her take Clark’s seat, as they presumably continue to discuss their next play.

From Los Angeles Times ● Jun. 2, 2026

One week later though, she was alongside the subs again for the return at Stamford Bridge.

From BBC ● Apr. 25, 2026

Expand that to the present day, including the era of five subs, and there are 10 players who qualify.

From BBC ● Mar. 27, 2026

America’s anti-submarine forces, known as hunter-killer groups, used planes, helicopters, warships, and nuclear-powered subs to track down enemy boats.

From "Fallout: Spies, Superbombs, and the Ultimate Cold War Showdown" by Steve Sheinkin

Vuskovic endured a difficult World Cup, subbed off after 66 minutes of Croatia's opening loss to England, then not appearing in their three subsequent games.

From BBC ● Jul. 19, 2026

Somewhere in the mix of all this is Ronaldo, who got the first knockout stage goal of his Cup career with that penalty kick, but also was subbed off late for fresher legs.

From The Wall Street Journal ● Jul. 3, 2026

"It's so tough playing an individual sport. You can't be subbed out, you just have to be dunked back in the deep end immediately," former British player Naomi Broady said on BBC TV.

From BBC ● Jun. 29, 2026

Gene Pitney took the track, subbed his vocals for Sedaka’s and wound up with a Top 10 hit at a time Sedaka couldn’t break the Top 40.

From Los Angeles Times ● Feb. 27, 2026

I make it through the first four innings of our state tournament game before my not-quite-completely-healed arm is throbbing so bad, I ask to be subbed out.

From "Fast Pitch" by Nic Stone

Nearing his 126th show, Fedigan has worked his way up the ranks from subbing in as a spotlight operator to overseeing the entire technical production of hit shows like “Chicago.”

From The Wall Street Journal ● Feb. 27, 2026

Megyn Kelly, however, defended Carlson, arguing on X that “No one is expecting any of the ppl subbing for Charlie to imitate Charlie.”

From Salon ● Oct. 29, 2025

Importantly, subbing out water for sports drinks is not going to cut it: “It functionally makes very little difference in terms of people’s outcome,” Charlton said.

From Slate ● Aug. 17, 2025

Dawson was subbing for Chris Woakes, who will miss the remainder of the match with a shoulder injury sustained on day one.

From BBC ● Aug. 1, 2025

We maintain a ten-point lead throughout, but Coach doesn’t risk subbing in any of the bench—not even when Pennsville calls time-out with only a minute to go.

From "Boy21" by Matthew Quick