This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To untie or make looser.

v. To free from restraint, pressure, or strictness.

v. To free (the bowels) from constipation.

verb-intransitive. To become loose or looser.

v. make something less tight; unfasten

v. To make loose; to free from tightness, tension, firmness, or fixedness; to make less dense or compact

v. To free from restraint; to set at liberty..

v. To remove costiveness from; to facilitate or increase the alvine discharges of.

verb-intransitive. To become loose; to become less tight, firm, or compact.

To make loose; free from tightness, tension, firmness, or fixedness: as, to loosen a knot; to loosen a joint; to loosen a rock in the earth.

To render less dense or compact: as, to loosen the soil about the roots of a plant.

To let loose; free from restraint or confinement.

To become loose; become less tight, firm, or compact.

v. make less severe or strict

v. make loose or looser

v. disentangle and raise the fibers of

v. become less severe or strict

v. cause to become loose

v. become loose or looser or less tight

v. make less dense

"Cool in the pan for 15 minutes or so; be sure to cut around the sides to loosen from the pan before cutting and serving. comments"

tighten   

loosened    loosening    loosens   

change    modify    alter    disentangle    straighten out    unsnarl    weaken   

to loosen a cough    to loosen the bowels    lose   

unloosen    loose   

loosened    loosening    loosen the purse strings    loosen the apron strings    loosener   

tighten    weaken    rending    loosing    strengthen    submergence    mlength    lower    sundering    powder puff