The Chinese word for jeans is
牛仔裤

niú zǎi kù

jeans

Chinese Definition

jeans
1. 牛仔裤
Components
牛
1. bovine, e.g. cow, bull, ox, buffalo, bison, yak
2. beef
乾gān炒.牛河 - beef chow fun
3. stubborn; pigheaded
4. (colloquial) arrogant
5. (mainland, Mandarin, slang) awesome; powerful
牛屄 - vulgar awesome
牛人 - an awesome person
6. (astronomy) the Ox, a Chinese constellation near Capricorn
7. (physics) Short for 牛頓, tr=niúdùn, newton
8. (Hong Kong Cantonese, computing) Short for 火牛, transformer
牛僧-孺 - Niu Sengru (Tang politician)
仔
1. (Min Nan) An interfix placed between two nouns to show the relationship between the two objects.
翁仔某 (ang-á-bó͘) - husband and wife, MN
2. (Min Nan) An interfix placed between two numbers to denote the value of 100, i.e. x (lang-lite, zh, sc=Hani, 仔) y = 100x + 10y.
三-仔-五 (saⁿ-á-gō͘) - three hundred fifty, MN
3. (Min Nan) An interfix used limitedly in certain temporal location adverbs.
今kin仔日 (kin-á-ji̍t) - today, MN
明bîn仔載 (bîn-á-chài) - tomorrow, MN
4. a suffix used after nouns
樹仔 (su-é) - tree, H
5. a suffix that makes a derogatory slur
阿山仔 (â-sân-é) - Mainlander, H
6. Only used in 仔肩
7. Used to show a verb has been completed before the last verb of a sentence, often in a sequence of events.
8. Used to indicate the present perfective.
我到仔有兩三日哉。 - tr=, I've been here for several days already., SH, ref=2010, Qian Nairong, (lang-lite, zh, sc=Hani, 《從〈滬語便商〉所見的老上海話時態》 (Tenses and Aspects? Old Shanghainese as Found in the Bo
覅讓俚逃走脫仔！ - Don't let him get away!, ref=(lang-lite, zh, sc=Hani, 江苏省志・方言志, page 538, W-SZ)
9. =====Usage notes=====
10. In some lects, such as Shanghainese, (l-lite, zh, sc=Hani, 了) is a lot more common nowadays. To distinguish between it, l-lite, zh, sc=Hani, 脫了, and l-lite, zh, sc=Hani, 脫, see 脫了Usage notes
裤
1. Simplified form of 褲