bounce something back

Từ điển Oxford Advanced Learner 8th

ˌbounce ˈback | ˌbounce sth ˈback derived
(computing)if an email bounces back, or the system bounces it back, it returns to the person who sent it because the system cannot deliver it
•I tried to send her an email but it bounced back.
•The system automatically bounces back emails which contain attachments.
Main entry: ↑bounce_derived