slacken
0 antonyms and opposites of slacken, grouped by meaning.
Verb — To gradually decrease in intensity or tautness; to become slack; to lag.
We haven't recorded synonyms for slacken yet. You can still read its full definition, where it comes from, or words that rhyme with it.
Etymology
From Middle English slakenen, equivalent to slack + -en.
Full origin of slacken →