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
The kid acts up, the dad disciplines him and mom just sends a sorry text.
—
Hannah Sacks, PEOPLE, 22 Sep. 2025
Then the engine started acting up, which would have cost up to $10,000 to fix.
—Shannon Pettypiece, NBC news, 22 Sep. 2025
Lots of time spent acting up and acting out with your family.
—Outside Online, 3 Sep. 2025
Johnson, who struggles with a neuroma, swears by her Oofos mules to keep it from acting up.
—Jennifer Heimlich, SELF, 29 Aug. 2025
See All Example Sentences for act up
Hannah Sacks, PEOPLE, 22 Sep. 2025
Then the engine started acting up, which would have cost up to $10,000 to fix.
—Shannon Pettypiece, NBC news, 22 Sep. 2025
Lots of time spent acting up and acting out with your family.
—Outside Online, 3 Sep. 2025
Johnson, who struggles with a neuroma, swears by her Oofos mules to keep it from acting up.
—Jennifer Heimlich, SELF, 29 Aug. 2025
See All Example Sentences for act up
Recent Examples of Synonyms for act up
Verb
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Others abused alcohol and drugs, were separated and divorced, or acted out violently.—
Arianna Huffington,
Fortune,
6 Nov. 2025
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As the five-year case unfolded, Betty continually lost court battles and continued to act out.—
Alex Gurley,
PEOPLE,
5 Nov. 2025
Verb
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Airlines also continue to cancel flights nationwide to meet FAA demands to cut up to 10% of flights within the next week.—
Michael Salerno,
AZCentral.com,
7 Nov. 2025
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The chicken, now cut up into small pieces at the lunch hour, soaks up the broth and packs an even more flavorful punch.—
Joseph Hernandez,
Kansas City Star,
30 Oct. 2025
Verb
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Moore turns her daughter around and shows off her backside, which is also covered in poop.—
Hannah Sacks,
PEOPLE,
9 Jan. 2026
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The 21st annual Dine Downtown starts Friday, with more than 30 Sacramento restaurants showing off their chops with unique, limited-time prix fixe menus.—
Camila Pedrosa,
Sacbee.com,
9 Jan. 2026
Verb
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Hours after the shooting, Noem defended the ICE officer who shot Good, saying the woman had blocked federal officers with her SUV and disobeyed orders to get out of her vehicle.—
Juliana Kim,
NPR,
9 Jan. 2026
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In response, the Indiana chapter of the American Civil Liberties Union, which represents Pakota Valley, filed a new lawsuit against the policy and filed a motion alleging the city is disobeying court orders.—
Cate Charron,
IndyStar,
6 Jan. 2026
Verb
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Running or horsing around with sparklers can also cause injuries and burns when users trip and fall.—
Justin Laube,
EverydayHealth.com,
2 July 2025
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Heath Ryan, who represented Australia in dressage at the 2008 Olympics, can be seen in the video – which the rider said is about two years old – hitting a horse around 40 times.—
Matias Grez,
CNN Money,
13 June 2025
Verb
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Coalition members also agreed to carry on with long-term military support for Ukraine and pledged defense cooperation, including training, defense production and intelligence sharing.—
Emma Bussey,
FOXNews.com,
7 Jan. 2026
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The notebook includes not just copies of letters in the Watkins papers but Virginia’s meticulous record of her fact-checking and her correspondence with Polly about the book’s success, spin-offs, sequels, and other projects carrying on to Polly’s death in 1962.—
Literary Hub,
Literary Hub,
7 Jan. 2026
Cite this Entry
“Act up.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/act%20up. Accessed 10 Jan. 2026.
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