One entry found for slacken.

Entry Word: slacken
Function: verb
Text: to make less taut <you'll need to slacken the rope a bit to get it free of that post>
Synonyms ease, loosen, relax, slack
Related Words detach, free, unbind, undo, unfasten, untie
Near Antonyms attach, bind, fasten, tie; constrain, restrain
Antonyms strain, stretch, tense, tighten