Increasing the number of personnel; hiring or adding staff—used for reinforcing workforce in companies, events, security, etc.
年末に向けてレジの増員が必要だと店長が言った。
The manager said additional cashiers need to be hired toward the year-end.
イベント当日は警備を増員して対応する予定です。
On the event day, security will be increased to handle things.
プロジェクトは人手不足のため増員が決まった。
The project decided to add personnel due to a shortage of hands.