| Unpen (v. t.) To release from a pen or from confinement. Thesaurus Entries loose, loosen, unbar, unbind, unbolt, unbridle, unbuckle, uncage, unchain, unfetter, ungag, unhandcuff, unhobble, unlash, unlatch, unleash, unlock, unloose, unloosen, unmanacle, unmuzzle, unpinion, unshackle, unstrap, untether, untie, untruss, unyoke | ![]() |