Definition of knuckle verb from the Oxford Advanced American Dictionary

 

knuckle

 verb
verb
NAmE//ˈnʌkl//
 
Verb Forms present simple I / you / we / they knuckle
 
he / she / it knuckles
 
past simple knuckled
 
-ing form knuckling
 
 
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Phrasal Verbsˌknuckle ˈdown (to something)ˌknuckle ˈunder (to somebody/something)
See the Oxford Advanced Learner's Dictionary entry: knuckle