Making a deep, loud roaring sound like a bull or a person shouting angrily; also the present participle form of bellow.
From Old English 'bellan' meaning to roar or bellow, possibly imitative in origin. Related to similar sounding words in Germanic languages.
Onomatopoeia alert! 'Bellow' sounds like what it means—that deep, resonant roar—which is why it appears so often in dramatic writing when describing angry people or large animals.
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