adv. phr. On a sudden wish or decision; suddenly; without thought or preparation. John had not planned to take the trip; he just left on the spur of the moment. Mary saw a help-wanted advertisement and applied for the job on the spur of the moment.
ON THE SPUR OF THE MOMENT
Meaning of ON THE SPUR OF THE MOMENT in English
American idioms English vocabulary. Английский словарь американских идиом. 2012