- any basslike fish of the genus Centropomus, especially C. undecimalis, inhabiting waters off Florida and the West Indies and south to Brazil, valued as food and game.
- any of several related marine fishes.
- a gesture of defiance, disrespect, or derision.
- to thumb the nose: a painter who cocks a snook at traditional techniques.
- any of several large game fishes of the genus Centropomus, esp C. undecimalis of tropical American marine and fresh waters: family Centropomidae (robalos)
- the sea pike Australuzza novaehollandiae
- cock a snook British
- to make a rude gesture by putting one thumb to the nose with the fingers of the hand outstretched
- to show contempt by being insulting or offensive
