be closely related and mutually dependent
As a Chinese idiom, Pinyin is ch ú NCH ǐ Xi ā NGX ū. It's like "lips and teeth depend on each other.". The source is Changan Hakka · sihaiye.
The origin of Idioms
"XuanZhen starts from sihaiye and Huoyanshan in the East, and connects with Changzhen and Huanghua. Sihaiye is just to the north of Huanghua town. The back of the appropriate mausoleum is the place where lips and teeth meet. "
Analysis of Idioms
Lips and teeth depend on each other
Idiom usage
As predicate, attribute; used in countries, regions, interpersonal relationships, etc
be closely related and mutually dependent
be dispelled like the thawing of ice - dòng jiě bīng shì
be superior to the works of the celebrated writers of the contemporary - yā dǎo yuán bái
have no definite conviction of one 's own - yī wéi liǎng kě
show respect to a ranking official - fù nǔ qián qū
fight a quick battle to force a quick decision - sù zhàn sù jué