Etymology
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muss (v.)

"to make untidy, put in a state of disorder," 1837, American English, probably a variant of mess in its sense of "to disorder." It was attested earlier (1830) as a noun meaning "disturbance, state of confusion." Related: Mussed; mussing.

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Definitions of muss
1
muss (v.)
make messy or untidy;
the child mussed up my hair
Synonyms: tussle
2
muss (n.)
a state of confusion and disorderliness;
Synonyms: mess / messiness / mussiness
From wordnet.princeton.edu