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.