- 1pen something (formal) to write something He penned a letter to the local paper.
- 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.
NAmE//pɛn//Verb Forms present simple I / you / we / they pen
he / she / it pens
past simple penned
-ing form penning