clanger
From Longman Dictionary of Contemporary Englishclangerclang‧er /ˈklæŋə $ -ər/ noun [countable usually singular] EMBARRASSED British English informal a silly or embarrassing mistake I can’t help noticing the occasional clanger in war films. He’s being blamed for dropping a massive political clanger (=making a silly or embarrassing remark).Examples from the Corpusclanger• But then young Charlie dropped the biggest clanger of his racing life.• Today that strong man was shown to have dropped a massive political clanger.