To extend by stretching
To remove a bend so as to make, or allow to become, straight.
To cast loose or untie
To cease to be bent; to become straight.
To relax in exertion, attention, severity, or the like
To release (a load) from a strain or from exertion; to set at ease for a time; to relax.
To unfasten sails from the spars or stays to which are attached for use.