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

 

muss

 verb
verb
BrE BrE//mʌs//
 
; NAmE NAmE//mʌs//
 
Verb Forms present simple I / you / we / they muss
BrE BrE//mʌs//
 
; NAmE NAmE//mʌs//
 
he / she / it musses
BrE BrE//ˈmʌsɪz//
 
; NAmE NAmE//ˈmʌsɪz//
 
past simple mussed
BrE BrE//mʌst//
 
; NAmE NAmE//mʌst//
 
past participle mussed
BrE BrE//mʌst//
 
; NAmE NAmE//mʌst//
 
-ing form mussing
BrE BrE//ˈmʌsɪŋ//
 
; NAmE NAmE//ˈmʌsɪŋ//
 
 
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muss something (up) (North American English) to make somebody’s clothes or hair untidy Hey, don't muss up my hair! Word Origin mid 19th cent. (also as a noun in the sense ‘disturbance or row’): apparently a variant of mess.
See the Oxford Advanced American Dictionary entry: muss