write back(redirected from write him back)
To respond (to some person, group, or organization) in writing, especially in a letter or email. A noun or pronoun can be used between "write" and "back." I'm sorry it's taken me so long to write back, but work has been incredibly busy lately. I've been meaning to write them back all week. It just keeps slipping my mind.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.