catch somebody on the hop

catch (one) on the hop

To encounter or try to communicate or work with someone at an inopportune time, such as when they are busy or preoccupied; to catch one off guard. I'll definitely help you with that report later—you just happened to catch me on the hop right now. If Dean was grumpy, you probably just caught him on the hop.
See also: catch, hop, on
Farlex Dictionary of Idioms.

catch somebody on the ˈhop

(British English, informal) find somebody in a situation where they are unprepared: The early start of winter that year caught many farmers on the hop.
See also: catch, hop, on, somebody
Farlex Partner Idioms Dictionary
See also:
  • catch (one) on the hop
  • catch someone on the hop
  • caught on the hop
  • catch at a bad time
  • catch (one) at a bad time
  • be busier than a one-legged man in a butt-kicking contest
  • contest
  • legged
  • have enough on (one's) plate
  • have enough on your plate