no obj.
1- (of a person or animal) emit a deep loud roar, typically in pain or anger（人, 动物）咆哮; 惨叫：
he bellowed in agony.
他痛苦地惨叫。
1.1
- reporting verb shout something with a deep loud roar吼叫, 大声发出, 大声喝道：
with obj. he bellowed out the order他大吼着发出命令
with direct speech 'Not sausage and mash again!' he bellowed“不要再上香肠和土豆泥了！”他吼道
with infinitive her parents were bellowing at her to stop.她父母亲喝令她停下。
1.2
- with obj. sing (a song) loudly and tunelessly大声地不合调地唱（歌）：
a dozen large men were bellowing 'Jerusalem'.
十来个身材魁梧的男人在吼唱“耶路撒冷”。
- a deep roaring shout or sound吼叫声; 呼啸声：
a bellow of rage
怒吼声
he delivers his lines in a bellow.
他高声喊叫着念他的台词。
词源
Middle English: perhaps from late Old English bylgan.