from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To release from a pen.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To release from a pen or from confinement.

from The Century Dictionary and Cyclopedia

  • To let out or release from being penned or dammed up; set free from a pen or confinement.
  • To deprive of feathers.


un- +‎ pen (Wiktionary)


  • Once at 7K I quoted to him from Keats 'Endymion the lines about those people who "unpen their baaing vanities to browse away the comfortable green and juicy hay from human pastures."

    The Private Life of Henry Maitland


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