too big for one's britches
01
behaving in a manner that highlights one's often non-existant superiority over others
Dialect
American
American
Disapproving
Idiom
Informal
Old use
例
Ever since he won that small award, he's been acting like he's too big for his breeches, bragging about it to everyone.
He started belittling his colleagues and acting superior after his book became a bestseller. He's gotten too big for his britches.
