Archaic or dialectal past tense and past participle of 'combine'; to have joined together.
From combine (Latin combinare, 'to join together') plus -ed. This spelling represents an older English pronunciation or dialectal variant, now superseded by 'combined' in standard English.
Many old words have surprising past tenses—'combind' shows how English spelling and pronunciation have standardized over centuries, like how 'spake' became 'spoke'!
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