Where does “萬里長城” come from?

萬里長城 (Chinese) comes from Chinese 萬, from Proto-Sino-Tibetan s-maŋ.

Ancestry of “萬里長城”, step by step

StepLanguageWordMeaning
1Chinese萬10,000
2Proto-Sino-Tibetans-maŋ—
Every word from Proto-Sino-Tibetan s-maŋ →Every word from Chinese 萬 →