on the spur of the moment
US /ɑn ðə spɜr əv ðə ˈmoʊmənt/
UK /ɑn ðə spɜr əv ðə ˈmoʊmənt/
1.
without planning or thinking about it in advance
:
•
We decided to go to the beach on the spur of the moment.
•
He bought the car on the spur of the moment without much thought.