I. verb — [no obj.] 1. (of a person or animal) emit a deep loud roar, typically in pain or anger • he bellowed in agony.
2. [ reporting verb] — shout something with a deep loud roar[with obj.] • he bellowed out the order
• [with direct speech]
‘Not sausage and mash again!’ he bellowed.
3. [with obj.] — sing (a song) loudly and tunelessly • a dozen large men were bellowing ‘Jerusalem’.
II. noun a deep roaring shout or sound • a bellow of rage.
– origin Middle English: perhaps from late Old English bylgan.