English for Today by Ganiu Abisoye Bamgbose (Dr GAB)
You should ~horn~ before overtaking another vehicle (nonstandard).
You should *hoot/sound your horn* before overtaking another vehicle (standard).
You should *honk* before overtaking another vehicle (standard).
“Horn” is a noun. On a vehicle such as a car, the horn is the device that makes a loud noise as a signal or warning.
As an idiom, to blow one’s horn means talking about oneself or one’s achievements especially in a way that shows pride or too much pride. This is used in American English. The British expression is “blow your own trumpet”.
If you honk the horn of a vehicle or if the horn honks, you make the horn produce a short loud sound.
GAB
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