Where does “รถโดยสารสองชั้น” come from?

รถโดยสารสองชั้น (Thai) comes from Thai รถโดยสาร, from Thai รถ, from Pali ratha, from Sanskrit रथ, from Proto-Indo-Iranian Hrátʰas, from Proto-Indo-European Hrót-h₂-os, from Proto-Indo-European Hret- — to roll; wheel; to run, roll.

รถโดยสารสองชั้น (Thai): double-decker bus (bus with two floors or levels)

Definitions

  1. double-decker bus (bus with two floors or levels)

Ancestry of “รถโดยสารสองชั้น”, step by step

รถโดยสารสองชั้น traces back through 3 separate lines of ancestry.

via Thai รถโดยสาร

StepLanguageWordMeaning
1Thaiรถโดยสารbus (a large road vehicle that carries many passengers)
2Thaiรถchariot, carriage, cart, wagon, or the like;...
3Palirathaa chariot, a car; delight, pleasure
4Sanskritरथchariot, car, especially a two-wheeled...
5Proto-Indo-IranianHrátʰaschariot
6Proto-Indo-EuropeanHrót-h₂-os
7Proto-Indo-EuropeanHret-to roll; wheel; to run, roll

via Thai สอง

StepLanguageWordMeaning
1Thaiสอง2
2Proto-Taisoːŋᴬtwo
3Middle Chinese

via Thai ชั้น

StepLanguageWordMeaning
1Thaiชั้นclass, rank, grade; storey, floor, level; layer
Every word from Proto-Indo-European Hret-Every word from Proto-Indo-European Hrót-h₂-osEvery word from Proto-Indo-Iranian Hrátʰas