To meet someone face-to-face; to encounter or be in the presence of another person.
会議で久しぶりに先輩と顔を合わせた。
I met my senior in person for the first time in a while at the meeting.
朝一番にチーム全員と顔を合わせて、今日の予定を確認した。
First thing in the morning I met with the whole team and confirmed today's schedule.
出張中は毎日クライアントと顔を合わせる必要がある。
During the business trip I need to meet with the client every day.
To co-star or appear together (e.g., in a show, film, or on-screen); to share the stage or screen.
そのドラマでは二人の俳優がしばしば顔を合わせている場面が多い。
In that drama there are many scenes where the two actors appear together.
来週のイベントで人気歌手と顔を合わせることになった。
At next week's event I'll be appearing together with a popular singer.
To be matched against someone; to face off or be opposed to someone (e.g., in a contest or comparison).
準決勝で強豪チームと顔を合わせることになった。
In the semifinals we'll be matched against a strong team.
翌日はライバル企業と直接顔を合わせる会議が予定されている。
The next day there is a meeting scheduled where we'll directly face the rival company.