1
general::
Phrase(s): write (up)on someone or something
1. to write about someone or something. (Upon is very formal here and much less commonly used than on.) • I had to write an essay, so I wrote on my uncle. • What are you going to write upon? 2. to write on someone’s skin or some thing. (Upon is formal and much less commonly used than on.) • Don’t write on Billy. After all, he’s your brother. • Who wrote on this page of the book? 3. to use someone [such as someone’s back] or something as a flat base to support something that is being written upon. • I have to sign this check. Here, let me write on you. • Do you mind if I write on your desk? I just need to sign this.
McGrawhill's American Idioms And Phrasal Verbs