To put on airs and graces; to act pretentiously or affectedly; to be dressed up ostentatiously.
他平时穿着很随意，今天却打扮得人模狗样地去参加派对。
He usually dresses very casually, but today he's dressed up putting on airs and graces to attend the party.
Next Idiom
To put on airs and graces; to act pretentiously or affectedly; to be dressed up ostentatiously.