A rare or dialectal term possibly referring to a setting or arrangement that is favorable or advantageous.
Likely a compound of 'gain' and 'set,' combining the concepts of profit or advantage with arrangement or positioning. This appears to be an extremely rare or obsolete formation with limited historical documentation.
Gainset is so obscure that even historical dictionaries barely mention it—it might be a dialect word or a one-time invention by a writer! It shows how English speakers in the past felt free to create new compound words by combining two existing ones.
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