There are 2 main definitions of shark in English:

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shark1

Syllabification: shark
Pronunciation: /SHärk
 
/

noun

1A long-bodied chiefly marine fish with a cartilaginous skeleton, a prominent dorsal fin, and toothlike scales. Most sharks are predatory, although the largest kinds feed on plankton.
Example sentences
  • This shark feeds primarily on bony fishes such as parrot, trigger, squirrel, surgeon, damsel and goat fishes as well as eels.
  • Great white sharks can grow as long as 5 meters and weigh 2,500 kilos.
  • The male sharks enter the cove with considerably more speed, driven by their single-minded drive to mate.
2A small Southeast Asian freshwater fish with a sharklike tail, popular in aquariums.
  • Two species in the family Cyprinidae: the small red-tailed black shark (Labeo bicolor), and the larger black shark (Morulius chrysophekadion)
3A light grayish-brown European moth, the male of which has pale silvery hind wings.
  • Genus Cucullia, family Noctuidae: several species, including C. umbratica

Origin

late Middle English: of unknown origin.

More
  • We do not know where the name for the fish comes from, but it is thought that the shark as in loan shark may be from German Schurke ‘worthless rogue’, influenced by the zoological term. Shirk (mid 17th century) originally meaning a scrounger, may be from the same German word. The sense ‘avoid work’ dates from the late 18th century.

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There are 2 main definitions of shark in English:

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shark2

Syllabification: shark
Pronunciation: /SHärk
 
/

noun

informal
1A person who unscrupulously exploits or swindles others: Coleby was a shark, not the sort of man to pay more when he could pay less property sharks want to develop 200 acres around the site See also loan shark.
More example sentences
  • They are the cyber-era equivalents of highwaymen, sharks, cheesy protection racketeers.
  • It is a scentless, unappealing botanical fraud sold by sharks to suckers.
  • But while property sharks may be kicking up their heels, small-time Plateau landowners and their tenants are bearing the brunt.
2US An expert in a specified field: a pool shark
More example sentences
  • A few unsavory types hung at the far end of the long dark bar, and a couple of sharks were playing pool in the side room.
  • Karaoke in a place like this fits right in next to the dudes watching the game on the tube and the pool sharks getting busy upstairs.
  • Preston, a pool shark, once beat singer Willie Nelson for $300,000 in dominoes.

Origin

late 16th century: perhaps from German Schurke 'worthless rogue', influenced by shark1.

More
  • We do not know where the name for the fish comes from, but it is thought that the shark as in loan shark may be from German Schurke ‘worthless rogue’, influenced by the zoological term. Shirk (mid 17th century) originally meaning a scrounger, may be from the same German word. The sense ‘avoid work’ dates from the late 18th century.

Definition of shark in:

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