Knocked up
Slacken and knocked up are semantically related. In some cases you can use "Slacken" instead a verb phrase "Knocked up".
Slacken
Slacken verb - To make less taut.
Knocked up and slacken are semantically related. Sometimes you can replace phrase "Knocked up" with "Slacken", this terms are similar.
Cite this Source
Slacken and Knocked up. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/knocked_up/slacken
Knocked up & Slacken. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/knocked_up/slacken>.
Slacken or Knocked up. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/knocked_up/slacken.
Google Ngram Viewer shows how "knocked up" and "slacken" have occurred on timeline