- 公孙杵臼 gōngsūnchǔjiù Gongsun ChujiuA famous figure of the Spring and Autumn period who sacrificed his life to save the Orphan of Zhao; a retainer of Zhao Shuo who plotted with [[程婴|程嬰|cheng2 ying1]] to protect the Zhao family heir from the villain Tu'an Jia.
- 杵臼之交 chǔjiùzhījiāo unlikely friendshipa deep friendship between people of different social statuses or classes; literally, the friendship between a pestle and a mortar
- 杵臼交 chǔjiùjiāo unlikely friendshipfriendship between people of different social status or wealth
- 杵臼关节 chǔjiùguānjié ball-and-socket jointA type of joint where a ball-like surface of one bone fits into a cup-like depression of another, as seen in the shoulder or hip