untighten - Wordage.info - Free Thesaurus Tool for Word Discovery - Expanded Thesaurus, Reverse Dictionary Lookup

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loosen collapse: become loose or looser or less tight; "The noose loosened"; "the rope relaxed"; make loose or looser; "loosen the tension on a rope"; make less dense; "loosen the soil"

slacken collapse: make slack as by lessening tension or firmness; become looser or slack; "the rope slackened"

relax collapse: cause to feel relaxed; "A hot bath always relaxes me"; become less tense, rest, or take one's ease; "He relaxed in the hot tub"; "Let's all relax after a hard day's work"; make less tight; "relax the tension on the rope"; become less severe or strict; "The rules relaxed after the new director arrived"; make less severe or strict; "The government relaxed the curfew after most of the rebels were caught"; become less tense, less formal, or less restrained, and assume a friendlier manner; "our new colleague relaxed when he saw that we were a friendly group"

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