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• crab
  crab

  noun

  any decapod crustacean of the suborder Brachyura, having the eyes on short stalks and a short, broad, more or less flattened body, the abdomen being small and folded under the thorax.
• Crab
  Crab

  noun

  the constellation Cancer, the fourth sign of the zodiac

crab

¹ American  

[krab] / kræb /

noun

1. any decapod crustacean of the suborder Brachyura, having the eyes on short stalks and a short, broad, more or less flattened body, the abdomen being small and folded under the thorax.

2. any of various other crustaceans, as the hermit crab, or other animals, as the horseshoe crab, resembling the true crabs.

3. Crab,

   1. Astronomy, Astrology. the zodiacal constellation or sign Cancer.

   2. Astronomy. the Crab Nebula.

4. any of various mechanical contrivances for hoisting or pulling.

5. Aeronautics. the maneuver of crabbing.

6. Informal. the crab louse. louse1

7. crabs,

   1. (used with a singular verb) a losing throw, as two aces, in the game of hazard.

   2. pediculosis.

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verb (used without object)

crabbed, crabbing

1. to catch or attempt to catch crabs.

2. to move sideways, diagonally, or obliquely, especially with short, abrupt bursts of speed; scuttle.

3. Aeronautics. (of an aircraft) to head partly into the wind to compensate for drift.

4. Nautical. to drift or advance with some movement sideways, especially when under tow.

verb (used with object)

crabbed, crabbing

1. to move (a vehicle or object) sideways, diagonally, or obliquely, especially with short, abrupt movements.

2. Aeronautics. to head (an aircraft) partly into the wind to compensate for drift.

idioms

1. catch a crab, to make a faulty stroke in rowing, so that the oar strikes the water forcibly on the backstroke.

crab ² American  

[krab] / kræb /

noun

1. a crab apple fruit or tree.

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crab ³ American  

[krab] / kræb /

noun

1. Informal. an ill-tempered or grouchy person.

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verb (used without object)

crabbed, crabbing

1. Informal. to find fault; complain.

2. (of hawks) to claw each other.

verb (used with object)

crabbed, crabbing

1. Informal. to find fault with.

2. to make ill-tempered or grouchy; embitter.

3. (of a hawk) to claw (another hawk).

4. Slang. to spoil.

crab ¹ British  

/ kræb /

noun

1. any chiefly marine decapod crustacean of the genus Cancer and related genera (section Brachyura ), having a broad flattened carapace covering the cephalothorax, beneath which is folded the abdomen. The first pair of limbs are modified as pincers See also fiddler crab soft-shell crab pea crab oyster crab

2. any of various similar or related arthropods, such as the hermit crab and horseshoe crab

3. short for crab louse

4. a manoeuvre in which an aircraft flies slightly into the crosswind to compensate for drift

5. a mechanical lifting device, esp the travelling hoist of a gantry crane

6. wrestling See Boston crab

7. rowing to make a stroke in which the oar either misses the water or digs too deeply, causing the rower to fall backwards

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verb

1. (intr) to hunt or catch crabs

2. (tr) to fly (an aircraft) slightly into a crosswind to compensate for drift

3. (intr) nautical to move forwards with a slight sideways motion, as to overcome an offsetting current

4. (intr) to move sideways

crab ² British  

/ kræb /

verb

1. (intr) to find fault; grumble

2. (tr) to spoil (esp in the phrase crab someone's act )

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noun

1. an irritable person

2. to attract unwelcome attention

Crab ³ British  

/ kræb /

noun

1. the constellation Cancer, the fourth sign of the zodiac

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crab ⁴ British  

/ kræb /

noun

1. short for crab apple

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Other Word Forms

• crabber
  noun
• crablike
  adjective

Etymology

Origin of crab¹

First recorded before 1000; Middle English crabbe, Old English crabba; cognate with Dutch krab, Old Norse krabbi; akin to German Krebs

Origin of crab²

First recorded in 1300–50; Middle English crabbe; perhaps special use of crab ¹

Origin of crab³

First recorded in 1350–1400; Middle English; back formation from crabbed

Explanation

A crab is a stubby sea creature with a flat body, eight legs, and claws. You can sometimes find tiny crabs in the sand on the beach. Crabs have a thick, shell-like covering called an "exoskeleton," and you can find them in both fresh and saltwater. Some types of crab are considered a delicacy, with sweet, delicate flesh often called "crab meat." There are many shelled sea creatures with crab in their names, like horseshoe crabs and hermit crabs, that aren't true crabs. The word crab comes from a Germanic root related to the Low German krabben, "to claw."

Example Sentences

See Examples For:

crab Crab crabbed crabbing

As a result, in 2015-16, regulators delayed the crab season for months, ultimately squeezing the typical seven months down to roughly two.

From Los Angeles Times ● Jul. 29, 2026

Serve them with crispy French fries and you’ve got a meal; or take things in a completely different direction with crab grilled cheese and peak-season tomato soup.

From Salon ● Jul. 12, 2026

Williams, whose main course options include Porth Eirias dressed crab and Welsh lamb, said he would never exile the scone.

From BBC ● Jul. 7, 2026

To avoid that issue, the researchers relied on a virtual crab image instead.

From Science Daily ● Jun. 5, 2026

The kids had fun, Emma and I chatted with a few more potential clients, and we got to eat leftover crab salad sandwiches.

From "South of Somewhere" by Kalena Miller

For critic Jamieson, highlights include Jamie Dornan's rugby sketch, in which he goes to elaborate lengths to injure himself, and Traitors spoof The Great Big Crab Man.

From BBC ● May 17, 2026

"There's a bright band, then nothing, bright band, nothing. No other pulsar shows this kind of striation. That uniqueness made the Crab Pulsar especially interesting -- and challenging -- to understand."

From Science Daily ● Mar. 28, 2026

Upon entering the festival, attendees can fuel up at the Terrace with Irv’s Burgers, a seafood boil from the Boiling Crab or a warm churro from Churrería El Moro.

From Los Angeles Times ● Mar. 27, 2026

Known as the Crab, because he was born with an extra finger, the hulking Rodriguez Castro is a lieutenant colonel in the island’s interior ministry in charge of his grandfather’s security detail.

From The Wall Street Journal ● Mar. 15, 2026

Grandpop dug into his pocket, then opened his palm to show Crab the cash he had just given him.

From "As Brave As You" by Jason Reynolds

This is a crabbed and mendacious interpretation of the law.

From Los Angeles Times ● Apr. 5, 2024

She also shaved her head — all to add authenticity as her queen evolved from youth to crabbed old age.

From New York Times ● Jun. 15, 2023

Such a crabbed view goes against how art is often created — spontaneously, with improvisation and serendipity.

From Washington Post ● Apr. 27, 2023

Right from the founding, then, analogical reasoning was bold and aspirational as frequently as it was crabbed and limiting.

From Slate ● Feb. 15, 2023

Char’s hand was large and round, the letters evenly spaced, each fully formed—completely unlike my crabbed, spiky writing.

From "Ella Enchanted" by Gail Carson Levine

The transmission malfunctioned in his 1978 boat, Miss Julie, which he also uses for crabbing.

From The Wall Street Journal ● Aug. 21, 2026

A GoFundMe set up in Meadows’ name described the deckhand from Montesano, Wash., as a father to “three amazing little boys” who died “while doing what he loved — crabbing out on Alaskan waters.”

From Los Angeles Times ● Apr. 6, 2026

Mr Walsh, who described himself as a "dabhand at handling crabs" after taking his kids crabbing on their holidays, said he gave the creature "a little stroke" and could see it was still moving.

From BBC ● Sep. 19, 2025

It’s a beautiful spot for nature lovers to hike, bike, camp, stargaze, fish and even go crabbing, but it’s most known for its special four-legged animals: wild horses!

From Seattle Times ● Jun. 3, 2024

Then he moved again, crabbing forward, but when he got there Kiowa was almost completely under.

From "The Things They Carried" by Tim O'Brien