1
general::
Phrase(s): go behind someone’s back
1. Lit. to move behind someone; to locate oneself at someone’s back. • The mugger went behind my back and put a gun to my spine. • Bob went behind my back and pushed me through the opening. 2. Fig. to do something that is kept a secret from someone affected by it. • I hate to go behind her back, but she makes so much trouble about things like this. • Please don’t try to go behind my back again!
McGrawhill's American Idioms And Phrasal Verbs