catch a weasel asleep

catch a weasel asleep

To surprise someone who is normally alert, shrewd, or on-guard. Primarily heard in US. You want to try to steal your transcript from the principal's office? You never catch a weasel asleep—and especially not that one!
See also: asleep, catch, weasel
Farlex Dictionary of Idioms.
See also:
  • weasel
  • too far north
  • cute hoor
  • horse-trade
  • horse trading
  • phishing attack
  • wise up to
  • wise up to (someone or something)
  • wise up to someone/something
  • a steal