Entry Word: slacken

Function: verb

Meaning: 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