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

 

dirty

 verb
verb
BrE BrE//ˈdɜːti//
 
; NAmE NAmE//ˈdɜːrti//
 
Verb Forms present simple I / you / we / they dirty
BrE BrE//ˈdɜːti//
 
; NAmE NAmE//ˈdɜːrti//
 
he / she / it dirties
BrE BrE//ˈdɜːtiz//
 
; NAmE NAmE//ˈdɜːrtiz//
 
past simple dirtied
BrE BrE//ˈdɜːtid//
 
; NAmE NAmE//ˈdɜːrtid//
 
past participle dirtied
BrE BrE//ˈdɜːtid//
 
; NAmE NAmE//ˈdɜːrtid//
 
-ing form dirtying
BrE BrE//ˈdɜːtiɪŋ//
 
; NAmE NAmE//ˈdɜːrtiɪŋ//
 
 
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(dirties, dirtying, dirtied, dirtied) dirty something to make something dirty
See the Oxford Advanced American Dictionary entry: dirty