muss up

muss up — phrasal verb

  • muss upbase form
  • musses up3rd person singular
  • mussing up-ing form
  • mussed uppast simple

1. to push, hit, or grab someone in a rough and aggressive way, often causing pain

1.phrasal verbtransitiveB2
Definition

to push, hit, or grab someone in a rough and aggressive way, often causing pain or injury.

Example

Quan got mussed up by a group of older boys after the football match.

passive: get mussed up by [aggressor]

The gang warned the shopkeeper they would muss him up if he called the police.

informal threat: muss someone up

Grammar Patterns

muss + someone + up

2. to make something untidy, disordered, or disorganised — for example, rumpling so

2.phrasal verbtransitiveB2
Definition

to make something untidy, disordered, or disorganised — for example, rumpling someone's hair, mixing up papers, or disrupting plans.

Example

The strong wind mussed up Sumin's hair just before her important presentation.

muss up + hair (concrete object)

Someone mussed up all the files on Gabriel's desk while he was out to lunch.

Common collocations
  • muss up someone's hair
  • muss up papers
  • muss up plans
  • muss up a room
Synonyms
  • mess up

    much more common and widely used; 'muss up' is older and more informal

  • rumple

    restricted to fabrics and hair; does not apply to abstract things like plans

  • disarrange

    more formal; rarely used in everyday speech

Antonyms
  • tidy up

    opposite action — to make neat and organised

  • straighten out

    opposite when referring to plans or arrangements

Grammar Patterns

muss + object + up

Usage Note

Object can be concrete (hair, papers, desk) or abstract (plans, arrangements).

Common Mistakes

The toddler mussed her mother's clean kitchen.
The toddler mussed up her mother's clean kitchen.
The particle 'up' is required; dropping it makes the sentence ungrammatical because 'muss' without 'up' is not a standalone verb in modern English.

Etymology

English (American dialect)English

"Muss" originated as a variant of "mess" in 19th-century American English, carrying the sense of disorder or rough treatment. The phrasal verb "muss up" developed as an informal alternative to "mess up," retaining the physical connotations of rough handling alongside the organisational meaning.