Definitions of cock:

noun: adult male bird
noun: adult male chicken
noun: obscene terms for penis
noun: the part of a gunlock that strikes the percussion cap when the trigger is pulled
noun: faucet consisting of a rotating device for regulating flow of a liquid
verb: set the trigger of a firearm back for firing
verb: tilt or slant to one side
Example: "Cock one's head"
verb: to walk with a lofty proud gait, often in an attempt to impress others