1
general::
1. Cast a vote by inserting a name not listed on the ballot, as in He asked them to write in his name as a candidate. [c. 1930] 2. Insert in a text or document, as in Please don't write in your corrections on the printed pages, but list them separately. [Late 1300s] 3. Communicate with an organization by mail, as in Listeners are being asked to write in their requests. [1920s]
American Heritage Idioms
2
general::
Phrase(s): write in(to something) (for something)
to send a written request to something for something in particular. • Please write in for a detailed recipe of all the dishes on today’s program. • I am going to write in for a clarification., Phrase(s): write someone in (on something)
to write the name of someone in a special place on a ballot, indicating a vote for the person. (Done when the person’s name is not already printed on the ballot.) • Please write my name in on the ballot. • I wrote in your name on the ballot., Phrase(s): write something in
Go to write something into something.
McGrawhill's American Idioms And Phrasal Verbs