1. (向某一机构)写信，发信
    If you write in to an organization, you send them a letter.

    e.g. What''s the point in writing in when you only print half the letter anyway?...
           只打印出一半就把信寄出去到底有什么用呢？
    e.g. So there''s another thing that you might like to write in to this programme about.
           所以，你或许还有另外一件事想写信告诉本节目。

2. (美国选举中)在选票上加写(非候选人的姓名)
    In the United States, if someone who is voting in an election writes in a person whose name is not on the list of candidates, they write that person''s name on the voting paper and vote for him or her.

    e.g. I think I''ll write in Pat Wilson...
           我想我要在选票上加写上帕特·威尔逊。
    e.g. I''m going to write him in on my ballot next year.
           明年我要在我的选票上写上他的名字。

3. see also: write-in

1. write to an organization

    e.g. Many listeners wrote in after the controversial radio program

2. cast a vote by inserting a name that does not appear on the ballot

    e.g. Many voters wrote in the names of strangers