1 ~ (sth) (at sb) to shout in a loud deep voice, especially because you are angry:
[V] They bellowed at her to stop but it was too late. * Do you have to bellow in my ear? * [VN] The coach bellowed instructions from the sidelines. [also Vspeech]
2 [V] when a large animal such as a BULL bellows, it makes a loud deep sound
bellow noun:
to let out a bellow of rage / pain
