write in

(noun) a candidate for public office whose name does not appear on the ballot and so must be written on the ballot by the voters. Synonyms: write-in candidate, write-in.

(noun) a vote cast by writing in the name of a candidate who is not listed on the ballot. Synonyms: write-in.

(verb) cast a vote by inserting a name that does not appear on the ballot. Synonyms: write in. Example: "Many voters wrote in the names of strangers."

(verb) write to an organization. Synonyms: write in. Example: "Many listeners wrote in after the controversial radio program."