Definition of yellow verb from the Oxford Advanced Learner's Dictionary

 

yellow

 verb
verb
BrE BrE//ˈjeləʊ//
 
; NAmE NAmE//ˈjeloʊ//
 
Verb Forms present simple I / you / we / they yellow
BrE BrE//ˈjeləʊ//
 
; NAmE NAmE//ˈjeloʊ//
 
he / she / it yellows
BrE BrE//ˈjeləʊz//
 
; NAmE NAmE//ˈjeloʊz//
 
past simple yellowed
BrE BrE//ˈjeləʊd//
 
; NAmE NAmE//ˈjeloʊd//
 
past participle yellowed
BrE BrE//ˈjeləʊd//
 
; NAmE NAmE//ˈjeloʊd//
 
-ing form yellowing
BrE BrE//ˈjeləʊɪŋ//
 
; NAmE NAmE//ˈjeloʊɪŋ//
 
 
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[intransitive, transitive] yellow (something) to become yellow; to make something become yellow Word Origin Old English geolu, geolo, of West Germanic origin; related to Dutch geel and German gelb, also to gold.
See the Oxford Advanced American Dictionary entry: yellow