刀子嘴巴,豆腐心

dāo zi zuǐ ba , dòu fu xīn

lit. knife mouth but heart of bean curd; sharp tongue concealing a caring heart

dāo

knife; blade; single-edged sword; cutlass (CL:把[ba3])

zi

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

zuǐ

mouth

ba

the east of Sichuan and Chongqing Municipality

,

dòu

legume; pulse; bean; pea (CL:顆|颗[ke1],粒[li4])

fu

decay

xīn

heart