knuckle

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˈnʌkəl/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/ˈnʌkəl/ ,USA pronunciation: respelling(nukəl)

Inflections of 'knuckle' (v): (⇒ conjugate)
knuckles
v 3rd person singular
knuckling
v pres p
knuckled
v past
knuckled
v past p

WordReference Random House Learner's Dictionary of American English © 2026
knuck•le /ˈnʌkəl/USA pronunciation   n., v., -led, -ling. 
n. 
  1. Anatomy[countable] any joint of a finger, esp. where a finger bends, or where a finger meets the hand.

v. 
  1. knuckle down, [no object]
    • to apply oneself with energy;
      to work earnestly;
      become serious.
    • Also, knuckle under. [no object] to admit that one is defeated;
      to submit;
      yield:He won't ever knuckle under to your threats.

WordReference Random House Unabridged Dictionary of American English © 2026
knuck•le  (nukəl),USA pronunciation n., v., -led, -ling. 
n. 
  1. Anatomya joint of a finger, esp. one of the articulations of a metacarpal with a phalanx.
  2. Anatomythe rounded prominence of such a joint when the finger is bent.
  3. Fooda joint of meat, consisting of the parts about the carpal or tarsal joint of a quadruped.
  4. Buildingan angle or protrusion at the intersection of two members or surfaces, as in the timbers of a ship or in a roof.
  5. See brass knuckles. 
  6. Buildinga cylindrical projecting part on a hinge, through which an axis or pin passes;
    the joint of a hinge.
  7. Building(in a wire mesh) a bend in a wire crossing another wire.
  8. Furniture(on a chair arm) one of the ridges left at the front end by longitudinal flutes carved to accommodate the fingers.
  9. Nautical, Naval Termsa pronounced edge formed by a change in the form of the shell of a hull.

v.t. 
  1. to rub or press with the knuckles.
  2. Games[Marbles.]to shoot (a marble) from the thumb and forefinger.
  3. 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.
  • 1325–75; Middle English knokel (akin to Dutch kneukel, German Knöchel), diminutive of a word represented by Dutch knok, German Knochen bone; see -le
knuckly, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::
knuckle /ˈnʌkəl/ n
  1. a joint of a finger, esp that connecting a finger to the hand
  2. a joint of veal, pork, etc, consisting of the part of the leg below the knee joint, often used in making stews or stock
  3. near the knuckleinformal approaching indecency
vb
  1. (transitive) to rub or press with the knuckles
  2. (intransitive) to keep the knuckles on the ground while shooting a marble
Etymology: 14th Century: related to Middle High German knöchel, Middle Low German knoke bone, Dutch knokˈknuckly adj
'knuckle' also found in these entries (note: many are not synonyms or translations):
Collocations: a knuckle of [pork, veal, beef], rapped the [child, boy, girl, student] on the knuckles, [tapped, knocked] on the [desk, door] with her knuckles, more...

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