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catch sb with their pants/trousers down

Definition

to discover someone doing something that they want to keep secret, usually something sexualFinding and discovering to ask someone unexpectedly to do or say something that they are not prepared forSurprising and shockingMaking people sad, shocked and upset
(Definition of catch sb with their pants/trousers down from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)