ADJ-GRADED [usually ADJ n] (产品或服务)高端的,高档的 Upmarket products or services are expensive, of good quality, and intended to appeal to people in a high social class.
(产品或服务)高端的,高档的 [mainly British] Upmarket is also an adverb.
in AM, usually use 美国英语通常用 upscale