An archaic or dialectal form of 'are' in English, used in some older texts or regional British dialects.
From Old English 'sindon' and 'sind,' which were variant forms of the verb 'to be.' This form persisted in some northern English dialects even as standard English moved toward 'are,' showing how language changes unevenly across regions.
You can find 'sind' in really old documents and realize that English speakers hundreds of years ago couldn't even agree on how to say 'you are'—it's like how today some people say 'y'all are' and others say 'you are,' just in an older accent!
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