To bellow is to shout in a deep, angry voice. If you constantly bellow at other drivers on the road, consider signing up for anger management classes.

Bellow comes from Middle English, and means "to roar like a bull." A cow's deep moo is called a low, so bellow just adds a big angry bull to the standard moo. We use bellow for human speech that has that angry power of a loud bovine, or for any loud, threatening noise. It can be a noun, as in the bellow of the thundercloud, or a verb, as when you bellow at your kid brother.

Definitions of bellow

v make a loud noise, as of an animal

“The bull bellowed
Type of:
emit, let loose, let out, utter
express audibly; utter sounds (not necessarily words)

v shout loudly and without restraint

Type of:
utter in a loud voice; talk in a loud voice (usually denoting characteristic manner of speaking)

n a very loud utterance (like the sound of an animal)

“his bellow filled the hallway”
bellowing, holla, holler, hollering, hollo, holloa, roar, roaring, yowl
Type of:
call, cry, outcry, shout, vociferation, yell
a loud utterance; often in protest or opposition

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