1 [intransitive and transitive] also yell out
to shout or say something very loudly, especially because you are frightened, angry, or excited:
'Help me!' she yelled hysterically.
I yelled out, 'Here I am!'
The crowd are on their feet yelling.
Don't you yell at me like that!
yell at somebody to do something
They yelled at him to stop.
yell (out) in surprise/pain etc
Clare yelled in pain as she fell.
He could hear Pete yelling at the top of his voice (=very loudly).
2 [intransitive] spoken especially American English
to ask for help:
If you need me, just yell.