catch with pants down
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catch (one) with (one's) pants down
To encounter or catch one by surprise in a vulnerable and often embarrassing position or situation. Thanks to that anonymous tip, we were able to catch the drug smugglers with their pants down—right when they were making the exchange. Jeff was caught with his pants down when he came to the meeting without having read the brief and the boss started firing questions at him.
catch (one) with one's pants down
Fig. to discover someone in the act of doing something that is normally private or hidden. (Literal uses are possible.) Some council members were using tax money as their own. But the press caught them with their pants down and now the district attorney will press charges.