직전에

직전에

"Just before" or "right before."

직전에 in this sentence expresses the timing 'immediately before' an action, highlighting the necessity of washing hands soon before starting to eat as a preparatory step.

밥 먹기 직전에 손을 씻어야 해요.

You need to wash your hands right before eating.

In this context, 직전에 is used to specify that the problem occurred just moments ahead of the meeting's scheduled start.

회의가 시작되기 직전에 문제가 발생했어요.

An issue arose right before the meeting started.

Here, 직전에 indicates that the action of sending the package was completed immediately preceding the train's departure.

기차가 떠나기 직전에 우체국에서 소포를 보냈습니다.

I sent the package at the post office right before the train departed.