xiā​zi​chī​tāng​yuán

to know what's what

瞎子吃汤圆 瞎子吃湯圓 xiā​zi​chī​tāng​yuán
to know what's what
(xiehouyu) to have a clear idea of the situation; refers to a blind person eating dumplings who, despite not seeing them, knows exactly how many they have eaten. Often used with the punchline 心里有数 xīn​lǐ​yǒu​shù.

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