loosenv. t.[See Loose, v. t.]1. To make loose; to free from tightness, tension, firmness, or fixedness; to make less dense or compact; as, to loosen a string, or a knot; to loosen a rock in the earth.()After a year's rooting, then shaking doth the tree good by loosening of the earth. (Bacon.)2. To free from restraint; to set at liberty..()It loosens his hands, and assists his understanding. (Dryden.)3. To remove costiveness from; to facilitate or increase the alvine discharges of.(Bacon.)v. i. To become loose; to become less tight, firm, or compact.(S. Sharp.)