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