muss up

verb

To thoroughly muss something.

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Meanings

verbmuss up (third-person singular simple present musses up, present participle mussing up, simple past and past participle mussed up)

present singular third person musses up · participle present mussing up · participle past mussed up · past mussed up

  1. transitiveTo thoroughly muss something.
  2. obsoleteslangTo treat roughly; to beat up.

    Tuxedo is a good-hearted, gentle, quiet, soft-voiced tobacco[…] no "fighting spirit" in it anywhere to muss up your tongue.

    1916 March 11, “[advertisement] You Men Who Have Pipes”, in Saturday Evening Post
  3. Used other than figuratively or idiomatically: see muss, up.
Cite this entry
APA

muss up. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/muss%20up

MLA

“muss up.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/muss%20up. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “muss up,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/muss%20up.

Source: muss up on Wiktionary, CC BY-SA 4.0.