To guard or protect; to put on guard or make someone aware of danger.
From en- (prefix) + guard (from Old French garde, meaning 'to watch or keep'). It's a somewhat archaic or rare form of the verb meaning to protect or warn.
While 'enguard' is rarely used today, it appears in older English texts as a way to say 'to make someone guard themselves'—it's the kind of word Shakespeare might have used instead of our simpler modern 'guard' or 'warn.'
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