MUSS UP


Meaning of MUSS UP in English

muss 1 /mʌs/ BrE AmE ( also muss up ) verb [transitive] informal especially American English

[ Date: 1800-1900 ; Origin: Probably from mess ]

to make something untidy, especially someone’s hair:

Briscoe reached down and mussed the boy’s hair.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.