凿死卯子

záo sǐ mǎo zi

variant of 鑿死鉚子|凿死铆子[zao2 si3 mao3 zi5]

záo

(bound form) chisel

to die

mǎo

old variant of 卯[mao3]

zi

noun suffix, as in 椅子[yi3 zi5] "chair"