4  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  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.] 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Knuckle  \Knuc"kle\,  n.  [OE.  knokel,  knokil  AS  cuncel;  akin  to 
  D.  knokkel  OFries  knokele  knokle,  G.  kn["o]chel,  Sw 
  knoge,  Dan.  knokkel  G.  knochen  bone,  and  perh.  to  E.  knock.] 
  1.  The  joint  of  a  finger,  particularly  when  made  prominent  by 
  the  closing  of  the  fingers.  --Davenant. 
 
  2.  The  kneejoint,  or  middle  joint,  of  either  leg  of  a 
  quadruped,  especially  of  a  calf;  --  formerly  used  of  the 
  kneejoint  of  a  human  being 
 
  With  weary  knuckles  on  thy  brim  she  kneeled  sadly 
  down  --Golding. 
 
  3.  The  joint  of  a  plant.  [Obs.]  --Bacon. 
 
  4.  (Mech.)  The  joining  pars  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. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Knuckle  \Knuc"kle\,  v.  t. 
  To  beat  with  the  knuckles;  to  pommel.  [R.]  --Horace  Smith. 
 
  From  WordNet  r  1.6  [wn]: 
 
  knuckle 
  n  :  a  joint  of  a  finger  when  the  fist  is  closed  [syn:  {knuckle 
  joint},  {metacarpophalangeal  joint}] 
  v  1:  press  or  rub  with  the  knuckles 
  2:  shoot  a  marble  while  keeping  one's  knuckles  on  the  ground 

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