水洩不通

shui3 xie4 bu4 tong1

lit. not one drop can trickle through (idiom); fig. impenetrable (crowd, traffic)

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水洩不通|水泄不通 [shuǐ xiè bù tōng] ► lit. not one drop can trickle through (idiom); fig. impenetrable (crowd, traffic)