unpen

[ uhn-pen ]
/ ʌnˈpɛn /

verb (used with object), un·penned, un·pen·ning.

to release from confinement.

Origin of unpen

First recorded in 1585–95; un-2 + pen2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019