【水泄不通】〖shu xiè bù tng〗[even a drop of water couldn't leak out; so closely that not a drop of water could have trickled through; be watertight; tightly packed]

水来土掩众志酣，

泄怨排纷溯根源。

不塞不流除蠹弊，

通权达变治久安。

像是连水也流不出去。形容拥挤或包围的非常严密。Like even water can not flow out. Describe crowded or surrounded very tightly. 同：风雨不透、人山人海。反：畅通无阻、四通八达。歇：马勺里洗菜。谜：江淹、泥堵河、阴沟堵塞。