Definition of catch someone with their pants or trousers down in English:

catch someone with their pants (or trousers) down

informal Catch someone in an embarrassingly unprepared state: it’s a wonder the government hasn’t been caught with its pants down
More example sentences
  • In Australia we were caught with our pants down when our nurses began to strike.
  • I mean, I knew the guy was a rotten apple, I knew what he was up to, and he still managed to catch me with my pants down because I simply didn't pay attention at the right time… ah, figuratively speaking, of course.
  • I could not believe the irony of the fact that for our one and only sighting of this most secretive of creatures I had been caught with my pants down, both metaphorically and literally speaking.
See parent entry: pants

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope