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

 

muck

 verb
verb
BrE BrE//mʌk//
 
; NAmE NAmE//mʌk//
 
Verb Forms present simple I / you / we / they muck
BrE BrE//mʌk//
 
; NAmE NAmE//mʌk//
 
he / she / it mucks
BrE BrE//mʌks//
 
; NAmE NAmE//mʌks//
 
past simple mucked
BrE BrE//mʌkt//
 
; NAmE NAmE//mʌkt//
 
past participle mucked
BrE BrE//mʌkt//
 
; NAmE NAmE//mʌkt//
 
-ing form mucking
BrE BrE//ˈmʌkɪŋ//
 
; NAmE NAmE//ˈmʌkɪŋ//
 
 
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Word Origin Middle English muk, probably of Scandinavian origin: compare with Old Norse myki ‘dung’, from a Germanic base meaning ‘soft’, shared by meek. Phrasal Verbsmuck aboutmuck somebody aboutmuck about with somethingmuck inmuck outmuck somethingup
See the Oxford Advanced American Dictionary entry: muck