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Region: UK | Usage example: I was caught on the hop by the sudden question.

Caught on the hop

Meaning

Surprised or unprepared.

Usage

Used when someone is unexpectedly thrown off guard.

Origin & History

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

Horse racing phrasing for being unready when the starter gun fires.

British idiom now used worldwide.