'Kēng kǒu' literally combines 坑 (kēng), meaning 'pit' or 'shaft', and 口 (kǒu), meaning 'mouth' or 'opening'. Together, they form a compound noun that specifically refers to the physical entrance or opening of a mine — where miners enter, equipment is lowered, and ore is extracted. It emphasizes the functional access point rather than the entire mining site.

This term is used almost exclusively in industrial, geological, or safety-related contexts — for example, in mining reports, safety regulations, or local descriptions of mining areas. It is not used metaphorically (unlike 'pit' in English) and does not apply to quarries, caves, or construction sites unless they function as active mines. While historically common in coal-mining regions like Shanxi or Hebei, the word remains standard in technical and administrative Chinese.