Definition
to become someone's responsibility or duty
（職責或任務）由某人承擔或負責
Since he was absent, the important task fell to me.
由於他缺席，這個重要的任務落到了我身上。
The completion of the project will ultimately fall to the management team.
專案的完成最終將由管理團隊負責。
With the implementation of the new policy, the added responsibilities will fall to each member.
隨著新政策的實施，新增的職責將由每位成員承擔。
it is your responsibility
這是你的責任。
The preparation for this speech falls entirely to you.
這次演講的準備工作完全落在你身上。
When issues arise, the final responsibility will fall to you.
當問題出現時，最終的責任將落在你身上。
Ensuring the success of this project is a shared responsibility, but the primary duty falls on your shoulders.
確保這個項目的成功是共同責任，但主要職責落在你肩上。