Where does “two-way” come from?

two-way (English) comes from English two, from Middle English two, from Old English twā, from Old English twēġen, from Proto-West Germanic twai-, from Proto-Germanic twai, from Proto-Indo-European dwóh₁ — two.

two-way (English): allowing traffic in two directions; moving in...

Definitions

  1. allowing traffic in two directions; moving in...

Ancestry of “two-way”, step by step

two-way traces back through two separate lines of ancestry.

via English two

StepLanguageWordMeaning
1EnglishtwoA numerical value equal to 2; this many dots;...
2Middle Englishtwotwo
3Old Englishtwātwo
4Old Englishtwēġentwo; twain
5Proto-West Germanictwai-two
6Proto-Germanictwaitwo
7Proto-Indo-Europeandwóh₁two

via English Way

StepLanguageWordMeaning
1EnglishWayChristianity
2Middle Englishway—
3Old Englishweġway; path; way, road, path
4Proto-West Germanicwegway, road
5Proto-Germanicwēgazwave; sea
6Proto-Indo-Europeanweǵʰ-to bring; to transport
Every word from Proto-Indo-European dwóh₁ →Every word from Proto-Germanic twai →Every word from Proto-West Germanic twai- →
two-way — Etymology, Origin & Word History | Etymology Explorer