on someone’s watch

on someone’s watch

mod. while someone is on duty. I guess I have to bear the blame since it happened on my watch.
See also: on, watch
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • on the bird
  • keep good time
  • watch out
  • What time have you got?
  • keep (close) watch for (someone or something)
  • watch it
  • Watch it!
  • keep a close eye/watch on somebody/something
  • keep a close watch on
  • keep watch on