suddenly, without planning in advance :
I phoned him up on the spur of the moment.
a spur-of-the-moment decision
suddenly, without planning in advance :
I phoned him up on the spur of the moment.
a spur-of-the-moment decision
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005