水洩不通 (seoi2 sit3 bat1 tung1) — 1. very crowded 2. guarded or defended so well that not even water can get through in Cantonese
seoiˊ²水sit˗₃洩batˉ¹不tungˉ¹通简 水泄不通
Mandarin Pinyin: shui3 xie4 bu4 tong1
Meaning of 水洩不通
noun1. very crowded 2. guarded or defended so well that not even water can get through