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Definition of Act up
1. Verb. Misbehave badly; act in a silly or improper way. "The children acted up when they were not bored"
2. Verb. Make itself felt as a recurring pain. "My arthritis is acting up again"
Definition of Act up
1. Verb. (intransitive idiomatic) To misbehave; to cause trouble. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Act Up
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