- (zoology) a scaleless fish with a cartilaginous skeleton that has 5 to 7 gill slits on each side of its head
- (sports) a person who feigns ineptitude to win money from others, as in "pool shark"
- (derisive, colloquial): a (sleazy) lawyer; an ambulance chaser
Etymology: As a scaleless fish, the word is first attested in the 1560s, of uncertain origin. For definitions 2 and 3, the noun forms derived from the verb form, below.
- obsolete: to steal or obtain through fraud.
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Full Definition of shark