email fork
When your coworker does not respond to the latest reply of an email thread, the discussion becomes forked between his reply and the latest. The fork is more severe when an email volley is accumulating participants, and you get left out. in which case, you'll hope someone will loop you in. the fork could be unintentional if the forker is just a slow-ass chicken pecker. but if he has a rep of being a habitual threadjacker, it is probably not
To avoid an email fork of the thread with a client, Becky sent Chad a DM that she was drafting a response to the client's latest questions.