Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: Probably from mess

muss

1 verb
     
muss1 also muss up [transitive] informal especially American English
to make something untidy, especially someone's hair:
Briscoe reached down and mussed the boy's hair.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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