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cock a snook
cock a snook
(British old-fashioned) to show that you do not respect something or someone by doing something that insults them (usually + at ) In the end he refused to accept his award, cocking a snook at the film industry for which he had such contempt.
cock a snook
Thumb one's nose, as in As soon as the teacher turned her back, the boys cocked a snook at her. This expression was first recorded in 1791 and the precise source of snook, here used in the sense of "a derisive gesture," has been lost. It is more widely used in Britain but is not unknown in America.