An archaic hunting cry or exclamation, possibly used to drive animals or signal during a hunt.
From Old English or Middle English, possibly imitative in origin like 'halloo' or 'tally-ho.' The 'for-' prefix may have intensified or emphasized the cry. Related to hunting terminology.
Medieval hunting had its own language of calls and cries—'forhoo' is like the 'yee-haw' of medieval England, a word that probably died out because hunting styles changed and nobody needed it anymore.
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