on the spur of the moment

Idioms & Phrases

on the spur of the moment

Impulsively, without prior preparation, as in He decided to join a tour to England on the spur of the moment. This expression alludes to the goading action of a spur to a horse. [Late 1700s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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