copy someone in
phrasal verb with copy verb [ I or T ] uk/ˈkɒp.i/ us/ˈkɑː.pi/
把电子邮件抄送给…
to send someone a copy of an email that you are sending to someone else
I'll copy you in on all emails relating to the project. 我会把和这个项目有关的邮件都抄送给你。