To Loosen

(transitive) To make loose. Synonyms: ease, relax, untighten
(intransitive) To become loose.
(transitive) To disengage (a device that restrains). Synonyms: undo, unfasten
(intransitive) To become unfastened or undone.
(transitive) To free from restraint; to set at liberty. Synonyms: liberate, release, set free
(transitive) To relieve (the bowels) from constipation; to promote defecation.
(transitive, obsolete) To create a breach or rift between (two parties).
(intransitive, obsolete) To sail away (from the shore). Synonym: put out