unbend

verb

1. To remove a bend so as to make, or allow to become, straight“to unbend a bow”
2. To release (a load) from a strain or from exertion; to set at ease for a time; to relax.“to unbend the mind from study or care”
3. To unfasten sails from the spars or stays to which are attached for use.
4. To cast loose or untie“Unbend the rope.”