Knuckle under

What is Knuckle under?

Knuckle under definition and meaning on Dictionary terms:
noun
a joint of a finger, especially one of the articulations of a metacarpal with a phalanx.
the rounded prominence of such a joint when the finger is bent.
a joint of meat, consisting of the parts about the carpal or tarsal joint of a quadruped.

an angle or protrusion at the intersection of two members or surfaces, as in the timbers of a ship or in a roof.
brass knuckles.
a cylindrical projecting part on a hinge, through which an axis or pin passes; the joint of a hinge.
(in a wire mesh) a bend in a wire crossing another wire.
(on a chair arm) one of the ridges left at the front end by longitudinal flutes carved to accommodate the fingers.
Nautical. a pronounced edge formed by a change in the form of the shell of a hull.

verb (used with object), knuckA.led, knuckA.ling.
to rub or press with the knuckles.
Marbles. to shoot (a marble) from the thumb and forefinger.

Verb Phrases
knuckle down, to apply oneself vigorously and earnestly; become serious: Just knuckle down for an hour or so and finish the work.Also knuckle under. to submit; yield.

 

reference: https://www.dictionary.com/browse/knuckle–under

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