linchpin

名詞

1. 1

   關鍵、核心、支柱

   She was the linchpin of the whole rescue operation.

   她是整場救援行動的關鍵人物。

2. 2

   車軸銷、制輪楔機械

   The wheel came off after the linchpin worked loose.

   車軸銷鬆脫後，輪子就掉了下來。