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English definition of “on the spur of the moment”

on the spur of the moment

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 .Not expected or planned
(Definition of on the spur of the moment from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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