Толковый словарь английского языка Oxford English Reference - posh

adj. & adv. colloq. --adj. 1 smart; stylish. 2 of or associated with the upper classes (spoke with a posh accent). --adv. in a stylish or upper-class way (talk posh; act posh). Phrases and idioms posh up smarten up. Derivatives poshly adv. poshness n. Etymology: 20th c.: perh. f. sl. posh a dandy: port out starboard home (referring to the more comfortable accommodation on ships to and from the East) is a later association and not the true origin