/ ˈbeləʊ; NAmE -loʊ/ verb
1.
bellow (sth) (at sb) to shout in a loud deep voice, especially because you are angry
SYN yell :
[ v ]
They bellowed at her to stop.
[ vn ]
The coach bellowed instructions from the sidelines.
[also v speech ]
2.
[ v ] when a large animal such as a bull bellows , it makes a loud deep sound
► bel·low noun :
to let out a bellow of rage / pain
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WORD ORIGIN
Middle English : perhaps from late Old English bylgan .