1. Become loose, looser or less tight
   "The noose loosened";
   - relax, loose
    
2. Make less tight or stiff
   "loosen the tension on a rope";
   - loose
    
3. Make less severe or strict
   "The government loosened the curfew after most of the rebels were caught";
   - relax
    
4. Become less severe or strict
   "The rules loosened after the new director arrived";
   - relax, soften
    
5. Disentangle and raise the fibers of
   "She loosened the wool before spinning it";
   - tease, tease apart
    
6. Make less dense
   "loosen the soil"

Derived forms: loosening, loosened, loosens

Type of: alter, change, disentangle, modify, straighten out, unsnarl, weaken