shark

1 [shahrk]
noun
1.
any of a group of elongate elasmobranch, mostly marine fishes, certain species of which are large, voracious, and sometimes dangerous to humans.
Idioms
2.
jump the shark, Informal. 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.

Origin:
1560–70; origin uncertain

sharklike, adjective
Dictionary.com Unabridged

shark

2 [shahrk]
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.
verb (used with object)
3.
Archaic. to obtain by trickery or fraud; steal.
verb (used without object)
4.
Archaic. to live by shifts and stratagems.

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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
shark1 (ʃɑːk)
 
n
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
 
[C16: of uncertain origin]
 
'sharklike1
 
adj

shark2 (ʃɑːk)
 
n
1.  a person who preys on or victimizes others, esp by swindling or extortion
 
vb
2.  archaic to obtain (something) by cheating or deception
 
[C18: probably from German Schurke rogue; perhaps also influenced by shark1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

shark
1569, of uncertain origin; apparently the word and the first specimen were brought to London by Capt. John Hawkins's second expedition (landed 1565; see Hakluyt).
"There is no proper name for it that I knowe, but that sertayne men of Captayne Haukinses doth call it a 'sharke' " [handbill advertising an exhibition of the specimen, 1569]
The meaning "dishonest person who preys on others," though only attested from 1599 (sharker in this sense is from 1594), may be the original sense, later applied to the large, voracious marine fish. It is possibly from Ger. Schorck, a variant of Schurke "scoundrel, villain," agent noun of M.H.G. schürgen (Ger. schüren) "to poke, stir." The Eng. word was applied to voracious or predatory persons, on the image of the fish, from 1707 (originally of pick-pockets); loan shark is attested from 1905. Sharkskin was used for binding books, etc. As the name of a type of fabric held to resemble it, it is recorded from 1932.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for sharks
The jets and sharks form a procession, and together they carry tony away.
Lampreys and sharks lack an operculum, they have multiple gill openings.
The basking shark is one of the largest known sharks, second only to the whale
  shark.
Targeted fishing for basking sharks is illegal in new zealand.
Image for sharks
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