a very loud utterance (like the sound of an animal); "his bellow filled the hallway"
a small valley between mountains; "he built himself a cabin in a hollow high up in the Appalachians"
shout out; "He hollered out to surrender our weapons"
utter a sudden loud cry; "she cried with pain when the doctor inserted the needle"; "I yelled to her from the window but she couldn't hear me"
complain; "What was he hollering about?"