pluralize

verb4

1. •
   To make plural.

   • The word "orange" can be pluralized into "oranges".
2. •
   To take a plural; to assume a plural form.

   • Nouns pluralize in English, but verbs do not.
3. •
   To multiply; to make manifold.
4. •
   (UK) To hold more than one ecclesiastical benefice at the same time.