Where does “地下線” come from?

地下線 (Japanese) comes from Japanese 地下, from Japanese 地, from Middle Chinese 地.

地下線 (Japanese): underground line, specifically an underground cable or wire

Definitions

  1. underground line, specifically an underground cable or wire

Ancestry of “地下線”, step by step

地下線 traces back through two separate lines of ancestry.

via Japanese 地下

StepLanguageWordMeaning
1Japanese地下underground; subterranean
2Japanese地earth, dirt; fabric, cloth; territory
3Middle Chinese地—

via Japanese 線

StepLanguageWordMeaning
1Japanese線line; level; beam
Every word from Middle Chinese 地 →Every word from Japanese 地 →Every word from Japanese 地下 →