English · Phrasal verb Attested

muss up

In real, traceable use. Part of the curated seed collection; community review is coming.

Sense 1

Meaning · English

To thoroughly muss something.

Where it’s used: Used American English

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Meaning · English

To treat roughly; to beat up.

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Meaning · English

Used other than figuratively or idiomatically: see muss, up.

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

What does “muss up” mean?

To thoroughly muss something.

Is “muss up” formal or informal?

No register label has been reviewed yet — treat it as neutral and check the usage notes above.

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