shark

¹ American  

[shahrk] / ʃɑrk /

noun

1. any of a group of elongate elasmobranch, mostly marine fishes, certain species of which are large, voracious, and sometimes dangerous to humans.

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idioms

1. jump the shark, to begin a decline in quality, popularity, relevance, etc., after reaching a peak.

   Some TV shows have jumped the shark once a popular cast member left the show.

shark ² American  

[shahrk] / ʃɑrk /

noun

1. a person who preys greedily on others, as by cheating or usury.

2. Informal. a person who has unusual ability in a particular field.

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verb (used with object)

1. Archaic. to obtain by trickery or fraud; steal.

verb (used without object)

1. Archaic. to live by shifts and stratagems.

shark ¹ British  

/ ʃɑːk /

noun

1. a person who preys on or victimizes others, esp by swindling or extortion

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verb

1. archaic to obtain (something) by cheating or deception

shark ² British  

/ ʃɑːk /

noun

1. any of various usually ferocious selachian fishes, typically marine with a long body, two dorsal fins, rows of sharp teeth, and between five and seven gill slits on each side of the head

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Other Word Forms

• sharklike
  adjective

Etymology

Origin of shark¹

First recorded in 1560–70; origin uncertain

Origin of shark²

1590–1600; < German dialect Schork, variant of Schurke rascal

Explanation

A shark is a large, carnivorous fish — although it's hard to calmly think, "That's just a large fish" when you run into a shark while you're swimming in the ocean. Almost all sharks live in the ocean, and while most of them are predators, the very largest sharks feed on plankton and tiny things like fish eggs. There are over four hundred species of shark, but only four have ever harmed humans; nevertheless, people have been afraid of these large, powerful animals for a long time. This dislike gave rise to the informal meaning of shark, "a person who swindles or preys on others."

Example Sentences

See Examples For:

shark

Dorota Skowronska-Krawczyk watches a Greenland shark glide slowly through the dark waters of the Arctic on her computer screen.

From Science Daily ● Aug. 23, 2026

For Skowronska-Krawczyk, the work raises the possibility that understanding how Greenland shark eyes remain healthy for centuries could eventually point researchers toward new strategies for preventing age-related vision loss.

From Science Daily ● Aug. 23, 2026

Riskier still, Arsenal was preparing to throw him into a Premier League shark tank full of title-winning apex predators such as Pep Guardiola, Jürgen Klopp, and José Mourinho.

From The Wall Street Journal ● Aug. 21, 2026

Scientific studies have shown that approaching or touching a shark leads to high levels of hormones called glucocorticoids.

From BBC ● Aug. 15, 2026

Half a dead shark had washed up in the tide.

From "Nim’s Island" by Wendy Orr

Related Words

• astute
• cagey
• canny
• crafty
• farsighted
• ingenious
• judicious
• keen
• penetrating
• perceptive
• probing
• prudent
• sensible
• sharp
• slick
• sly
• smart
• wily
• wise