Definition
To temporarily take over someone else's responsibilities or duties when they are unable to fulfill them.
頂替他人工作，臨時補缺
Due to the manager's sudden departure, I had to step into the breach and handle all the urgent matters.
由於經理的突然離職，我不得不臨時頂替他的位置處理所有緊急事務。
When the lead researcher fell ill, her colleague stepped into the breach to ensure the experiment could proceed smoothly.
當首席研究員生病時，她的同事臨時頂替她的位置，確保實驗能順利進行。
As the project deadline approached, team members took turns stepping into the breach to ensure all tasks were completed on time.
隨著專案截止日期的臨近，團隊成員輪流頂替確保所有任務按時完成。