“To act up”: Learn the expression through definition and examples

What does “To act up” mean?

The phrase "to act up" means 'to behave badly' or 'to misbehave.' When someone says that someone or something is 'acting up', they are referring to the person's or thing's disruptive or improper behavior.

How is the expression used in real life?

Example

The kids acted up at the grocery store.

Example

My computer acts up whenever I try to open multiple programs.

Example

The dog acts up when it's left alone for too long.

What context can I use each expression in?

  • 1Describing children's behavior

    The kids acted up at the grocery store.

    The children act up when they're tired.

  • 2Describing malfunctioning or misbehaving objects

    My computer acts up whenever I try to open multiple programs.

    The car acted up on the way to work.

  • 3Describing animals' behavior

    The dog acts up when it's left alone for too long.

    The cat acted up and knocked over a vase.

Good things to know:

What is the origin of the phrase?

The phrase "to act up" is a common slang expression that originated in English. It is widely used in informal conversations and has become a part of everyday language.

Can the phrase be used on its own?

The phrase "to act up" is typically used within a sentence to describe someone's behavior. It is not commonly used on its own.

Is the phrase offensive?

The phrase "to act up" is not offensive. It is a slang term used to describe someone's behavior.

Audience for the phrase

The phrase "to act up" is commonly used by people of all ages and backgrounds. It is a casual expression that can be understood by most English speakers.

Is the phrase specific to an accent or country?

The phrase "to act up" is not specific to any particular accent or region. It is used in English-speaking countries worldwide.

Synonyms & Antonyms

Synonyms

  • misbehave
  • act out
  • behave badly
  • cause trouble
  • be naughty

Antonyms

  • behave
  • be well-behaved
  • behave properly
  • behave correctly
  • behave appropriately

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