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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Some of the most outrageous scenes are between Stacy, who likes to act out, and her forbearing therapist (Will Arnett).—
Anne Thompson,
IndieWire,
4 June 2026
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In the video, Allie dramatically acted out both sides of the conversation, capturing the feeling of trying to extract a straightforward answer from her mom.—
Ashley Vega,
PEOPLE,
3 June 2026
Verb
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Instead of dwelling in doubt, cut up paper and throw it around.—
Literary Hub,
Literary Hub,
20 May 2026
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Firefighting crews worked Monday to cool residual heat and prevent hot spots from causing reignition, using chainsaws to fell and cut up hazardous trees, inspecting each section for heat and using hoses to extinguish any remaining embers.—
Forum News Service,
Twin Cities,
20 May 2026
Verb
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In addition, referees were instructed to apply the rules regarding fouls and misconducts more strictly – a move meant to protect players and their inventiveness.—
Cesar R. Torres,
The Conversation,
26 May 2026
Verb
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On Wednesday, the 60-year-old actress showed off her svelte physique in a skimpy orange two-piece from her Elizabeth Hurley Beach brand.—
Ashley Hume,
FOXNews.com,
1 June 2026
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Ideally, other plants are starting to show off in their stead.—
Pedro Moura,
Los Angeles Times,
1 June 2026
Verb
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In 2024, the agency claimed that X security staff sometimes had to pointedly disobey Musk in order to remain in compliance.—
Ashley Belanger,
ArsTechnica,
4 June 2026
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Jakubowski faces charges of second-degree reckless endangerment, risk of injury to a minor, reckless driving, interfering with an officer, improper use of maker plates, possession of drug paraphernalia, disobeying the signal of an officer and failure to maintain the proper lane.—
Justin Muszynski,
Hartford Courant,
29 May 2026
Verb
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Ortiz navigated past 17 other horses around the final turn and made a hard charge down the stretch.—
Stephen Whyno,
The Orlando Sentinel,
3 May 2026
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Ortiz navigated past 17 other horses around the final turn and made a hard charge down the stretch.—
Stephen Whyno,
Chicago Tribune,
2 May 2026
Verb
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Four of the five Timberwolves-Spurs games were carried on Disney’s biggest cable outlet, ESPN, while the remaining outing aired on ABC.—
Anthony Crupi,
Sportico.com,
3 June 2026
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But while the Ritz carried on in the same splendid fashion as always, the Crillon blasted off in search of something new.—
Matt Ortile,
Condé Nast Traveler,
3 June 2026
Cite this Entry
“Act up.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/act%20up. Accessed 9 Jun. 2026.
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