1.a very loud utterance (like the sound of an animal);
his bellow filled the hallway
2.a small valley between mountains;
he built himself a cabin in a hollow high up in the Appalachians
1.shout out;
He hollered out to surrender our weapons
2.utter a sudden loud cry;
she cried with pain when the doctor inserted the needle
3.complain;
What was he hollering about?