the opposite side; the other side; the other party — the place or person located across from something (e.g., across the street, opposite seat).
駅の向かい側に新しいスーパーができた。
A new supermarket opened on the other side of the station.
向かい側の席の人に声をかけられた。
The person in the seat opposite me spoke to me.
会議では向かい側のチームと条件を話し合った。
In the meeting we negotiated terms with the team on the other side.