KNUCKLE (2)

knuckle (2). Knuckle, n. a joint of the fingers, knee, knot

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Knuc″kle, v. i. [imp. & p. p. Knuckled (?);; p. pr. & vb. n. Knuckling (?).] To yield; to submit; — used with down, to, or under. To knuckle to. (a) To submit to in a contest; to yield to. See To knock under, under Knock, v. i. (b) To apply one's self vigorously or earnestly to; as, to knuckle to work.