back to back

Từ điển Oxford Advanced Learner 8th

ˌback to ˈback idiom
1. if two people stand back to back, they stand with their backs facing or touching each other
see also ↑back-to-back
2. if two or more things happen back to back, they happen one after the other
•The team had to play three games back to back.
Main entry: ↑back_idiom