Definition of loosens:
(v) :
(transitive) To make loose.
(v) :
(intransitive) To become loose.
(v) :
(transitive) To disengage (a device that restrains).
(v) :
(transitive) To free from restraint; to set at liberty.
(v) :
(transitive) To relieve (the bowels) from constipation; to promote defecation.
(v) :
(intransitive) To become unfastened or undone.