Where does “một cách” come from?

một cách (Vietnamese) comes from Vietnamese một, from Proto-Vietic moːc, from Proto-Mon-Khmer muuj — one.

một cách (Vietnamese): adverbializes adjectives; in a... way/manner/fashion; -ly

Definitions

  1. adverbializes adjectives; in a... way/manner/fashion; -ly

Ancestry of “một cách”, step by step

một cách traces back through two separate lines of ancestry.

via Vietnamese một

StepLanguageWordMeaning
1Vietnamesemộtone; the eleventh lunar month; only; sole
2Proto-Vieticmoːcone
3Proto-Mon-Khmermuujone

via Vietnamese cách

StepLanguageWordMeaning
1Vietnamesecáchway, manner, fashion; grammatical case; to be...
Every word from Proto-Mon-Khmer muuj →Every word from Proto-Vietic moːc →Every word from Vietnamese một →