To be in harmony or in sync with someone; to work well together (e.g., in performance, teamwork, or conversation).
二人は長年のコンビで、舞台では息が合っている。
The two have been a duo for years and are in perfect sync on stage.
新しいチームメンバーともすぐに息が合った。
We quickly got in sync with the new team member.
二人は性格が合うだけでなく、仕事でも息が合う。
The two not only get along personally but also work well together.
演奏中に息が合わなくてミスしてしまった。
We made a mistake because we weren't in sync during the performance.