transitive verb
Etymology: Middle English writen in
1.
a. : to insert in a document, text, or other writing
write in an amendment to a law
b.
(1) : to insert (a name not listed on a ballot or voting machine) in an appropriate space by writing or use of a printed sticker
(2) : to cast (a vote) in this manner
2. : to write to a center of activity or source of supply
teachers are encouraged to write in their requests — James Britton