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English definition of “on the spur of the moment”

on the spur of the moment

informal
C2 describes a decision, action, etc. that is sudden and done without any planning: We hadn't planned to go away - it was one of those spur-of-the-moment decisions. We just jumped in a car on the spur of the moment and drove to the seaside.
(Definition of on the spur of the moment from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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