Act up
Act up verb - To behave badly.
Knock
Knock verb - To come into usually forceful contact with something.
Cite this Source
Knock and Act up. (2016). Retrieved 2026, August 12, from https://thesaurus.plus/related/act_up/knock
Act up & Knock. N.p., 2016. Web. 12 Aug. 2026. <https://thesaurus.plus/related/act_up/knock>.
Knock or Act up. 2016. Accessed August 12, 2026. https://thesaurus.plus/related/act_up/knock.
Google Ngram Viewer shows how "act up" and "knock" have occurred on timeline