Shouts or cries loudly, or loud shouts or cries expressing strong emotion.
From Old English 'gellan' meaning 'to yell or howl,' related to Old Norse 'gjalla' and Old High German 'gellan.' The word is likely onomatopoetic, imitating the loud noise of human shouting.
The word 'yell' has been around for over a thousand years as an onomatopoeia—it literally sounds kind of like what it means if you say it loudly, and this is why it shows up in similar forms across all Germanic languages.
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