4. (Mech.) The joining parts of a hinge through which the pin or rivet
passes; a knuckle joint.
5. (Shipbuilding) A convex portion of a vessel's figure where a sudden
change of shape occurs, as in a canal boat, where a nearly vertical
side joins a nearly flat bottom.
6. A contrivance, usually of brass or iron, and furnished with points,
worn to protect the hand, to add force to a blow, and to disfigure the
person struck; as, brass knuckles; -- called also knuckle duster.
[Slang.]
Knuckle joint (Mach.), a hinge joint, in which a projection with an
eye, on one piece, enters a jaw between two corresponding projections
with eyes, on another piece, and is retained by a pin which passes
through the eyes and forms the pivot. -- Knuckle of veal (Cookery), the
lower part of a leg of veal, from the line of the body to the knuckle.
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. [Colloq.]
See To knock under, under Knock, v. i. (b) To apply one's self
vigorously or earnestly to; as, to knuckle to work. [Colloq.]
Knuc"kle, v. t. To beat with the knuckles; to pommel. [R.] Horace
Smith.
Knuc"kled (?), a. Jointed. [Obs.] Bacon.