Slack
Slack verb - To make less taut.
Usage example: the skipper ordered the crew to slack off the sheets on the mainsail
Undo and slack are semantically related in unfastened topic. In some cases you can use "Undo" instead the word "Slack" as a verb or an adjective.
Undo
Undo verb - To deprive of courage or confidence.
Slack and undo are semantically related in unfastened topic. Sometimes you can use "Slack" instead the word "Undo" as a verb or an adjective.
Cite this Source
Undo and Slack. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/slack/undo
Slack & Undo. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/slack/undo>.
Undo or Slack. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/slack/undo.
Google Ngram Viewer shows how "slack" and "undo" have occurred on timeline