catch on the hop

Meaning

1. catch sb on the hop

   to surprise sb by doing sth when they are not expecting it and not ready for it

From the same entry

• catch your breath
• catch your death
• catch eye
• catch it
• catch napping
• catch red - handed
• catch with their pants down
• off balance
• be in a cleft stick
• the early bird catches the worm
• catch fancy
• catch on the raw