'Shark' definitions:

Definition of 'shark'

(from WordNet)
noun
Any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales
noun
A person who is ruthless and greedy and dishonest
noun
A person who is unusually skilled in certain ways; "a card shark"
verb
Play the shark; act with trickery
verb
Hunt shark

Definition of 'Shark'

From: GCIDE

Definition of 'Shark'

From: GCIDE
  • Shark \Shark\, v. t. [Of uncertain origin; perhaps fr. shark, n., or perhaps related to E. shear (as hearken to hear), and originally meaning, to clip off. Cf. Shirk.] To pick or gather indiscriminately or covertly. [Obs.] --Shak. [1913 Webster]

Definition of 'Shark'

From: GCIDE
  • Shark \Shark\, v. i. [imp. & p. p. Sharked; p. pr. & vb. n. Sharking.]
  • 1. To play the petty thief; to practice fraud or trickery; to swindle. [1913 Webster]
  • Neither sharks for a cup or a reckoning. --Bp. Earle. [1913 Webster]
  • 2. To live by shifts and stratagems. --Beau. & Fl. [1913 Webster]