FromProto-Vietic*kəc ~ *kɨc, fromProto-Mon-Khmer*ʔic ~ *ʔiə[c] ~ *ʔ[ə]c. Cognate withVietnamesecứt(“shit”).
For the semantic development, compareMalaytahi besi,Javaneseꦠꦲꦶ(tai),Burmeseသံချေး(samhkye:),Chepangखय(khəy), all mean "rust".
The original meaning was taken over byé, a cognate ofVietnameseỉa(“to shit”), and is now both a verb and a noun.
kếch
kếch