American Idioms – Idiom Wizard Lists Over 5,500 Idioms & Slang Descriptions

Act up


Return of a painful feeling. Also in a curiously similar vein, it can mean one who is disruptive, like a child among adults. So your illness may act up (return) and your young child may be creating a riot in a public place.

“I left work early as my stomach was acting up so I went home to bed.”

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