To keep step; to walk at the same pace. Figuratively, to act in concert or align one's pace, plans, or views with others.
二人は並んで歩調を合わせて駅へ向かった。
The two walked side by side, keeping in step as they headed for the station.
プロジェクトを成功させるには、チーム全員が歩調を合わせることが大事だ。
To make the project successful, it's important that the whole team act in concert.
政治家は党の方針に歩調を合わせる必要がある場合が多い。
Politicians often need to align themselves with their party's policies.
演奏者が歩調を合わせないと曲が乱れてしまう。
If the performers don't keep time together, the piece falls apart.