side by side

Từ điển Oxford Advanced Learner 8th

ˌside by ˈside idiom
1. close together and facing in the same direction
• There were two children ahead, walking side by side.
2. together, without any difficulties
• We have been using both systems, side by side, for two years.
• The two communities exist happily side by side.
Main entry: ↑side_idiom