linchpin
🇺🇸
/ˈlɪntʃpɪn/
🇬🇧
/ˈlɪntʃpɪn/
The most important person or thing in a group or plan that holds everything together.
In our team, Sarah is the linchpin because she keeps everyone on track.
在我們團隊中,Sarah是關鍵人物,因為她讓每個人都保持在正確的軌道上。