The word "bellow" can be used as both a noun and a verb, and it generally refers to making a loud noise.
In literature, "bellow" can be used metaphorically to describe someone expressing strong emotions or anger. For example, "She bellowed her frustration at the unfair treatment."
While "bellow" primarily refers to loud noises, it can also be used in a broader sense to describe passionate or intense expressions of feeling.
Currently, there are no widely recognized idioms or phrasal verbs that specifically use "bellow." However, you can create phrases like "bellow out" to indicate shouting something loudly, e.g., "He bellowed out the song at the concert."
To bellow means to make a loud sound or shout. It can describe both animal sounds and human expressions of strong emotion.