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spur-of-the-moment

informal

Definition

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 spur-of-the-moment from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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