A young bull calf or small bull, or a type of domestic animal young; a regional or dialect term for a young bovine.
From 'bull' combined with a diminutive suffix '-chin,' similar to how 'lambkin' comes from 'lamb.' This appears to be an older or regional term that survives mainly in historical or dialect texts.
Diminutive suffixes like '-kin,' '-chin,' and '-let' were far more common in older English for talking about baby animals—we used to say 'pigchin' and 'lamkin,' now mostly forgotten except in nursery rhymes!
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