| This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “The similarity to 臆 is intriguing, but the *ŋ- is unexplainable, as usually it's *h- or *k- that would be added to null-initial words. See also 屹 (SV: ngất) ~ 肊/臆 (SV: ức) via phonetic series 乞 ~ 乙, for phonetic precedent?” |
From Proto-Vietic *ŋək (“chest”).