verb
yells; yelled; yelling
to say (something) very loudly especially because you are angry, surprised, or are trying to get someone's attention [no obj]
[no obj] :to make a sudden, loud cry
yell your head off
noun
plural yells
[count] a sudden, loud cry - often + of
US :a usually rhythmic shout or cheer used especially in schools or colleges to show support for sports teams