Things that are posh are swanky, fancy, and high-class. Posh things usually cost a lot of money, too.

If something is dirty, cheap, and shoddy, it will never be accused of being posh. Posh things are elegant and expensive. A posh apartment is gorgeous and classy. A posh restaurant has fancy food and you probably have to dress up to go there. Posh places are luxurious and fancy-schmancy. So it's no surprise that rich people tend to like things and places that are posh.

Definitions of posh

adj elegant and fashionable

“a posh restaurant”
classy, swish
fashionable, stylish
having elegance or taste or refinement in manners or dress

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