American English

Definition of muss verb from the Oxford Advanced American Dictionary

 

muss

 verb
verb
NAmE//mʌs//
 
muss something (up)Verb Forms present simple I / you / we / they muss
 
he / she / it musses
 
past simple mussed
 
-ing form mussing
 
 
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to make someone's clothes or hair messy Hey, don't muss up my hair!
See the Oxford Advanced Learner's Dictionary entry: muss