To shout loudly or cry out with a strong, loud voice; a loud shout or cry.
From Old English 'giellan' meaning to yell or sing loudly, related to Old Norse 'gjalla'. The word has Germanic roots and has maintained its basic meaning of loud vocalization throughout its history.
Yelling triggers the body's fight-or-flight response in both the yeller and the listener, releasing stress hormones like cortisol and adrenaline. College 'yell leaders' were the predecessors to modern cheerleaders, organized to lead crowd chants at sporting events in the early 1900s.
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