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
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
Likewise, when the young men started acting up, Josephine Holt took a keen interest in her newspaper.
—Literary Hub, 21 Jan. 2026
If your trackpad is acting up, keyboard shortcuts can keep you productive without fighting the cursor.
—Ken Colburn, AZCentral.com, 19 Jan. 2026
See All Example Sentences for 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
Likewise, when the young men started acting up, Josephine Holt took a keen interest in her newspaper.
—Literary Hub, 21 Jan. 2026
If your trackpad is acting up, keyboard shortcuts can keep you productive without fighting the cursor.
—Ken Colburn, AZCentral.com, 19 Jan. 2026
See All Example Sentences for act up
Recent Examples of Synonyms for act up
Verb
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Mia is really acting out her character and has butt pads so lumpy that Michelle Visage got up off her couch to come over to the Hamptons to yell at her.—
Brian Moylan,
Vulture,
25 Mar. 2026
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But gaslighters don't necessarily act out of pure malice, Sweet says.—
Emma Bowman,
NPR,
25 Mar. 2026
Verb
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Most Popular Notorious murderer Richard Crafts, who used a chain saw to cut up his wife’s body and a wood chipper to dispose of it, is out of prison and living in a halfway house, a state Department of Correction spokeswoman said Friday.—
Edmund H. Mahony,
Hartford Courant,
27 Mar. 2026
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When the singing was done Ma Binney brought me back to her tent and cut up a tomato, put it between two slices of bread, and served it to me on a china plate taken from a wooden chest next to her bed-roll.—
Literary Hub,
Literary Hub,
18 Mar. 2026
Verb
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The Lancers showed off outstanding pitching, starting with Gary Morse striking out 16 in their opener.—
Eric Sondheimer,
Los Angeles Times,
30 Mar. 2026
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UConn’s Chris Freeman showed off an NFL-caliber leg, kicking a 65-yard field goal.—
Dom Amore,
Hartford Courant,
29 Mar. 2026
Verb
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South Windsor police have charged Rodriguez with evading responsibility, disobeying the signal of an officer, reckless driving, engaging police in pursuit and improper use of a marker, license or registration.—
Justin Muszynski,
Hartford Courant,
17 Mar. 2026
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Michael Schade, who works in the department’s traffic division, said most e-bike accidents were caused by riders disobeying basic traffic rules, like running red lights and not stopping at stop signs.—
Alissa Gary,
Sun Sentinel,
12 Mar. 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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There will be no one left to carry on the camp’s spiritual traditions, which are irrevocably tied to the land.—
Literary Hub,
Literary Hub,
25 Mar. 2026
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Blub, for his part, likely carried on swimming without a care in the world — unaware that his laps around a small tank had just made international headlines.—
Ryan Brennan,
Kansas City Star,
24 Mar. 2026
Cite this Entry
“Act up.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/act%20up. Accessed 1 Apr. 2026.
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