linchpin
US /ˈlɪntʃ.pɪn/
UK /ˈlɪntʃ.pɪn/
명사
비녀장
the most important member of a group or part of a system, that holds together the other members or parts or makes it possible for them to operate as intended:
예시:
•
Woodford is the linchpin of the British athletics team.