I. posh 1 /pɒʃ $ pɑːʃ/ BrE AmE adjective informal
[ Date: 1900-2000 ; Origin: Perhaps from posh 'money, showy man' (19-20 centuries) ]
1 . a posh restaurant, hotel, car etc is expensive and looks as if it is used or owned by rich people:
a posh private school
2 . British English upper class:
Her parents are terribly posh.
II. posh 2 BrE AmE adverb British English informal
talk posh to talk in an upper-class way