catch sb with their pants/trousers down
to discover someone doing something that they want to keep secret, usually something sexual
to ask someone unexpectedly to do or say something that they are not prepared for
Thesaurus: synonyms and related words
Finding and discovering
- a fishing expedition idiom
- alight
- ascertain
- break fresh/new ground idiom
- breakthrough
- catch sb red-handed idiom
- flush
- get wind of sth idiom
- happen
- happen on/upon sth/sb
- have a (good) nose for sth idiom
- have got something there idiom
- root sth/sb out
- run sb/sth to ground idiom
- scent
- search
- search sth/sb out
- smell
- sniff sth out
- stumble
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You can also find related words, phrases, and synonyms in the topics:
Surprising and shocking