ㄕㄥˊshéngㄇㄛˋ

  1. 木工工具禮記·經解》:繩墨不可曲直。」比喻法度規矩史記··孫子吳起》:婦人左右前後規矩繩墨出聲。」

lit. carpenter's straight line marker, same as 墨斗, fig. rules, rules and regulations