Posh means elegant, fancy, or luxurious in a way that suggests wealth and high social status. A posh restaurant has white tablecloths, expensive meals, and waiters in formal attire. A posh neighborhood features large houses with manicured lawns and tree-lined streets. When someone dresses in a posh way, they wear elegant, expensive clothes that look sophisticated and refined.

The word often carries a sense of being upper-class or exclusive. In Britain, where the word is especially common, a posh accent refers to the refined way of speaking associated with wealthy, educated people. A posh hotel might have marble floors, crystal chandeliers, and doormen in uniform.

You might describe a friend's birthday party as posh if it featured catered food, fancy decorations, and formal invitations, rather than pizza and paper plates. Sometimes people use posh with a hint of teasing, suggesting something is trying a bit too hard to seem fancy. But generally, calling something posh means it's upscale and impressive, designed for people who can afford the finer things in life.