涵空 [－－]

Jyutping haam4 hung1
Pinyin hán kōng

Definitions (Wiktionary)
  1. noun, Min-Nan
    culvert
    (syn.) 涵洞
  2. noun, Hokkien, Mainland-China
    sewer; covered drain
    (syn.) 阴沟, 阴空, 暗沟, 暗溝, 涵沟, 陰空, 陰溝, 涵溝