on the spur of the moment

US /ɑn ðə spɜr əv ðə ˈmoʊmənt/
UK /ɑn ðə spɜr əv ðə ˈmoʊmənt/
"on the spur of the moment" picture
1.

一時興起, 心血來潮

without planning or thinking about it in advance

:
We decided to go to the beach on the spur of the moment.
我們一時興起決定去海灘。
He bought the car on the spur of the moment without much thought.
一時衝動就買了那輛車,沒怎麼考慮。