impulse

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im|pulse /'ɪmpʌls/ (impulses)
1 [N-VAR] oft N to-inf
An impulse is a sudden desire to do something.
Unable to resist the impulse, he glanced at the sea again...
2 [N-COUNT]
An impulse is a short electrical signal that is sent along a wire or nerve or through the air, usually as one of a series.
3 [ADJ] ADJ n
An impulse buy or impulse purchase is something that you decide to buy when you see it, although you had not planned to buy it.
The curtains were an impulse buy.
4 [PHRASE] PHR after v
If you do something on impulse, you suddenly decide to do it, without planning it.
Sean's a fast thinker, and he acts on impulse...

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