Definition of "Loosen" :

verb: become loose or looser or less tight

"The noose loosened."

verb: make loose or looser

"Loosen the tension on a rope."

verb: make less dense

"Loosen the soil."

verb: cause to become loose

"Loosen the necktie."

verb: disentangle and raise the fibers of

verb: become less severe or strict

verb: make less severe or strict