Slacken and Unfasten

Slacken

Slacken verb - To make less taut.
Usage example: you'll need to slacken the rope a bit to get it free of that post

Unfasten and slacken are semantically related. In some cases you can use "Unfasten" instead a verb "Slacken".

Nearby Words: slack, slackness, slacker, slackening

Unfasten

Unfasten verb - To disengage the knotted parts of.

Slacken and unfasten are semantically related. Sometimes you can use "Slacken" instead a verb "Unfasten".

Nearby Word: unfastening
Cite this Source
Unfasten and Slacken. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/slacken/unfasten
Slacken & Unfasten. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/slacken/unfasten>.
Unfasten or Slacken. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/slacken/unfasten.
Google Ngram Viewer shows how "slacken" and "unfasten" have occurred on timeline