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 years 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.
Origin: see loose.