1
as in to act out
to behave badly
the two-year-old was acting up in church so much that her dad had to take her outside
Synonyms & Similar Words
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Antonyms & Near Antonyms
2
as in to cut up
to engage in attention-getting playful or boisterous behavior
you should have seen the boys acting up when they put on their aprons
Synonyms & Similar Words
Example Sentences
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Recent Examples of act up
Bruce, as the stunt shark built to menace them is nicknamed, is acting up and delaying the acting itself.
—
Christopher Smith, Oc Register, 10 Mar. 2026
Meanwhile, the guests, who have literally just arrived five minutes ago, are already acting up.
—Rafaela Bassili, Vulture, 10 Mar. 2026
Excess dust may also cause your allergies to act up.
—Madeline Buiano, Martha Stewart, 22 Feb. 2026
Koutouvides transitioned to life after football, found success in real estate development throughout Connecticut, but the pain of losing the Super Bowl twinges and acts up like an old joint injury.
—Dom Amore, Hartford Courant, 8 Feb. 2026
See All Example Sentences for act up
Christopher Smith, Oc Register, 10 Mar. 2026
Meanwhile, the guests, who have literally just arrived five minutes ago, are already acting up.
—Rafaela Bassili, Vulture, 10 Mar. 2026
Excess dust may also cause your allergies to act up.
—Madeline Buiano, Martha Stewart, 22 Feb. 2026
Koutouvides transitioned to life after football, found success in real estate development throughout Connecticut, but the pain of losing the Super Bowl twinges and acts up like an old joint injury.
—Dom Amore, Hartford Courant, 8 Feb. 2026
See All Example Sentences for act up
Recent Examples of Synonyms for act up
Verb
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Garcia says, acting out the usual blush of so many bewildered men.—
Darío Gael Blanco,
Vanity Fair,
25 Apr. 2026
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Friends and family say Wright acted out throughout the trial, including missing previous court dates and removing himself from the stand.—
WCCO Staff,
CBS News,
20 Apr. 2026
Verb
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The new congressional map in Virginia effectively cuts up the state’s 11 House districts to give Democrats an advantage in 10 of them.—
Joseph Konig,
PEOPLE,
22 Apr. 2026
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The Gates Foundation plans to cut up to 500 jobs, or about 20% of its staff, in the coming years as part of a long-term restructuring, as the foundation also undergoes an external review of its ties to the late financier Jeffrey Epstein.—
Brittany Miller,
FOXNews.com,
21 Apr. 2026
Verb
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Following tea with the king and queen in the White House Green room, the Trumps showed off the White House’s new beehive to the royal couple.—
Kathryn Palmer,
USA Today,
28 Apr. 2026
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Sophomore Nate Roberts is a 6-5, 240-pounder who has blocking experience and showed off versatility catching passes in the spring.—
Cameron Teague Robinson,
New York Times,
27 Apr. 2026
Verb
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However, all of the city’s fire stations seemingly disobeyed the mayor by lowering their flags.—
R. Christian Smith,
Chicago Tribune,
29 Apr. 2026
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Trump had to relent on a scheme to prosecute Fed Chair Jerome Powell for disobeying White House commands to cut interest rates.—
David Frum,
The Atlantic,
26 Apr. 2026
Verb
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Bevel was horsing around with the Reverend James Orange and Andy Young in the courtyard under King's balcony, according to Orange.—
Gail Sheehy,
Vanity Fair,
20 Feb. 2026
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But Andrew continued to live at the home and was often seen riding his horse around Windsor Great Park and photographed waving to crowds.—
Martha Ross,
Mercury News,
12 Feb. 2026
Verb
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Equations define lines that carry on off the chalkboard, but to where?—
Quanta Magazine,
Quanta Magazine,
29 Apr. 2026
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As spring carries on and summer approaches, our homes are already starting to get hot and stuffy.—
Nolan Lewis,
Architectural Digest,
27 Apr. 2026
Cite this Entry
“Act up.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/act%20up. Accessed 1 May. 2026.
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