(~s, ~ing, ~ed)
If someone ~s their car horn or if a car horn ~s, it produces a short sound or series of sounds.
People set off fireworks and ~ed their car horns...
Car horns ~ as cyclists dart precariously through the traffic...
= hoot
VERB: V n, V
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Toot is also a noun.
The driver gave me a wave and a ~.
N-SING