Chin noun 2phrases 4 noun2 •[plural only] A tribe in Myanmar.Oral tradition and archaeological evidence suggest the Chin were the earliest Tibeto-Burman group to come to the Chindwin Valley, a settlement process starting as early as the 4ᵗʰ century. — 2021 •A state of Myanmar. Phrases with Chin chin upBe happy; cheer up. keep one's chin upTo remain positive and cheerful. lead with one's chinTo leave one's chin unprotected. take on the chinTo accept without flinching or complaining.