Definition of on impulse (or on an impulse) in English:

on impulse (or on an impulse)

phrase

  • Suddenly and without forethought; impulsively.

    ‘on an impulse he returned to the bar’
    ‘she acted purely on impulse’
    • ‘He had health worries and was short of money but had acted on impulse to provide the children with something he had promised them.’
    • ‘Purely on impulse I leaned forward, my eyes closing of their own accord as Winter tilted her head up just a fraction.’
    • ‘I stared at him for a moment, and then, acting completely on impulse, I pulled his head down and kissed him.’
    • ‘It's imperative that you don't act on impulse during this period, and that you think through the consequences of your actions.’
    • ‘I wonder if he really did act on an impulse, or if there's more to it?’
    • ‘On impulse, I quickly leaned over and kissed him before getting out of the vehicle.’
    • ‘He very rarely acts on impulse, but ever since Evelyn died, his emotions have been askew.’
    • ‘Maybe I should try acting on impulse, instead of thinking so much.’
    • ‘Before you are allowed to place a bet there is a message asking you to confirm your bet so you are less likely to act on impulse.’
    • ‘Mary Queen of Scots was recorded as very tall and beautiful but with a fiery temperament that often caused her to act on impulse and brought forth criticisms of tactlessness.’
    impulsively, spontaneously, on the spur of the moment, without forethought, without planning, without thinking twice, without premeditation, unpremeditatedly
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