From Longman Dictionary of Contemporary Englishcock a snook at somebody/somethingcock a snook at somebody/somethingRUDE/IMPOLITE British English informal to show clearly that you do not respect someone or something He has always tried to cock a snook at authority. → cock
Examples from the Corpus
cock a snook at somebody/something• Tom Keating spent a lifetime cocking a snook at the art world.• The federal parliament also cocked a snook at the United Nations administration in Kosovo. 