What do you call the sound emitted by a car horn? Is there a formal, non-informal term for the sound? I am pretty sure there is an informal and a formal word for it, but I rather have the formal word.
The word is honk.
(transitive, intransitive) To use a car horn.
They stood and observed how long it took for the other cars to honk.
(intransitive) To make a loud, harsh sound like a car horn