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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.
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.
write in (something)
to send a letter or electronic message to an organization or business A lot of customers write in their complaints and get nothing from the company in response. Write in today and let us know what you think.
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]
1. To cast a vote by inserting some name not listed on a ballot: The members of the minority party wrote in their candidate's name on their ballots. Write me in for mayor in the next election!
2. To insert something in a text or document: I wrote in a disclaimer at the end of the article. You forgot to cite your sources for the paper, so I wrote them in for you.
3. To insert a character or scene into a narrative work: The editor insisted that the author write in a happy ending to the story. I revised the play and wrote some new characters in.
4. To communicate with some organization by mail: Please write in with a completed entry form.