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. Neither sharks for a cup or a reckoning. --Bp. Earle. 2. To live by shifts and stratagems. --Beau. & Fl.