From Longman Dictionary of Contemporary Englishwrite in phrasal verb1 WRITEto write a letter to an organization to give an opinion, ask for information etc If you would like a copy of our fact sheet, please write in, enclosing a stamped addressed envelope. to And so I wrote in to Radio Brighton.2 write something ↔ in to write a piece of information in the space provided for it on a form or document Provide some space for students to write in their hobbies.3 write somebody ↔ in American EnglishPPV to add someone’s name to the official list on your voting form, to show that you want to vote for them The campaign to write in Johnson for governor failed. → write-in → write→ See Verb table
Examples from the Corpuswrite to• Occasionally fans write in to demand that offside be abolished altogether.• The reader wrote in to say he was unconvinced.• All faults must be written in to the book by the person making the report.write-inˈwrite-in noun [countable] American EnglishPPV a vote you give to someone by writing their name on your ballot paper
Examples from the Corpuswrite-in• Setencich could mount a write-in or independent effort and possibly win re-election, Quinn said.