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English definition of “catch sb on the hop”

catch sb on the hop

UK informal
to do something when someone is not ready for it and is not able to deal with it: I'm afraid you've caught me on the hop - I wasn't expecting you till next week .Surprising and shockingMaking people sad, shocked and upset
(Definition of catch sb on the hop from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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