đục

• (Hà Nội) IPA^(key): [ʔɗʊwk͡p̚˧˨ʔ]
• (Huế) IPA^(key): [ʔɗʊwk͡p̚˨˩ʔ]
• (Saigon) IPA^(key): [ʔɗʊwk͡p̚˨˩˨]

From Proto-Vietic *duːk, from some form of Chinese 鑿 (OC *[dz]ˤawk) (B-S) (SV: tạc). Cognate with Thavung tuk⁷ ("burin"), Iu Mien zuqc and White Hmong txaug.

đục • (𨯹)

1. to carve, to chisel
2. to drill

Non-Sino-Vietnamese reading of Chinese 濁 (“dirty”, SV: trọc). Note that Phan (2013) has rejected this etymology.

đục

1. (of transparent substances) not clear; cloudy, murky, opaque, etc.

   Antonym: trong

   nước đục ngầu ― very murky water

   đục thuỷ tinh thể ― with a cataract (literally, “with a cloudy lens”)

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “From etym. 1?”)

đục

1. (Southern Vietnam, colloquial) to punch; to throw a punch

   Synonyms: thụt, đấm

   đục phù mỏ ― to give a beating until the opponent's lips are busted

• https://ecommons.cornell.edu/items/82422b28-3e0a-47b2-803b-38e6a21203c5 Lacquered Words: The Evolution of Vietnamese under Sinitic Influences from the 1st Century B.C.E. through the 17th Century C.E. Phan, John D. (2013)