Meaning of act up | Babel Free

Definitions

1. To misbehave; to cause trouble.
   idiomatic, intransitive
2. To perform the duties of an appointment senior to that actually held; to deputise for a superior.
   idiomatic, intransitive

Equivalents

Examples

“My allergies act up during hay fever season.”

“Children may act up in class in an effort to get attention.”

“My car started acting up after I drove through that huge puddle.”

“Acting up is always recommended when you find yourself under a new boss.”

CEFR level