Definition of pen verb from the Oxford Advanced American Dictionary

     

    pen

     verb
    verb
    NAmE//pɛn//
     
    Verb Forms present simple I / you / we / they pen
     
    he / she / it pens
     
    past simple penned
     
    -ing form penning
     
     
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  1. 1pen something (formal) to write something He penned a letter to the local paper.
  2. 2 pen somebody/something (in/up) to shut an animal or a person in a small space At clipping time sheep need to be penned. The whole family was penned up in one room for a month.
See the Oxford Advanced Learner's Dictionary entry: pen