A loud call or shout to attract attention; to shout or yell loudly, especially to hail someone or direct animals.
From Middle English halow, hallow; possibly imitative in origin, or from Old Norse hallo or Old French haler; used for hunting calls and maritime hailing since medieval times.
Halloa is a hunting cry that's been used for centuries to direct dogs and alert other hunters—it's the ancestor of the modern 'hello,' but with that gutsy, outdoor roar built in!
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