A young sow (female pig) or a dialect term for a pig of uncertain age or status.
From dialectal or regional English, possibly combining gaver or gaw (an old word for a cow or bovine) with the diminutive suffix -ick. The exact origin is uncertain and may be Scottish or Northern English.
Gaverick is the kind of word that linguists love—it's so obscure and regionally specific that it might represent an entire local farming vocabulary that's almost vanished.
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