1. a cut above
例：She thinks she's a cut above her neighbors.
2. get on your high horse
例：I'm not going to get up on a high horse and tell you that you're wrong for doing this.
例：His advice may be good, but he's much too bossy.
4. put on airs and graces
例：He was always putting on airs and graces.
5. too clever by half
"Too clever by half" was how one former teacher described him.
6. too big for someone’s boots
例：I think the boss is growing too big for his boots.