on impulse
idiomPart ofimpulse
on impulse — idiom
1. Without previous thought or planning; because of a sudden, unplanned wish.
1.idiom
Definition
Without previous thought or planning; because of a sudden, unplanned wish.
Example
Jessica picked up the vintage lamp on impulse at a flea market and later wished she had checked the price first.
Most shoppers who buy items near the register do so on impulse rather than by plan.