おoさき先sakiにni
1.
In a situation where one person is leaving or taking action ahead of another, it signifies the act of doing something first or ahead of someone else.
2.
Used as a courteous expression when one is departing before another, indicating a respectful acknowledgment of the situation.
3.
Conveys a sense of priority or precedence in a sequence of actions, often implying that one has completed their part before others.
Example:
お先にどうぞ。