1. (of a person) stop bending, stand straight up
   "She unbent from her gardening position";
   - straighten
    
2. Free from flexure
   "unbend a bow"
    
3. Make less taut
   "He unbent the wire to straighten it";
   - relax
    
4. Unfasten, as a sail, from a spar or a stay
   "The sailors unbent the mainsail as the storm approached"
    
5. Rest from work; become less busy, tense or anxious
   "He finally unbent after finishing the project";
   - relax, loosen up, unwind, decompress, slow down, take it easy
    
6. Release from mental strain, tension, or formality
   "unbend the mind from absorbing too much information"

Derived forms: unbending, unbends, unbent

Type of: change posture, change state, loose, loosen, loosen up, relax, straighten, straighten out, turn, unfasten, unlax [informal, rare], unstrain, unwind

Antonym: flex, tense