too big for one's boots
成語所屬單字boots
too big for one's boots — 慣用語
1. behaving as if one is more important or clever than one really is
1.慣用語
釋義
自以為了不起；目中無人
behaving as if one is more important or clever than one really is
例句
Ever since he passed the exam, he has been getting too big for his boots.