swelled head
A feeling that you are very important or more important than you really are.
Завышенная самооценка, завышенное самомнение; задирать нос.
When John won the race, he got a swelled head.
Pretty girls shouldn't get a swelled head about it.
Now that she’s famous, she’s getting a swelled head.
Теперь, когда она знаменита, она начинает задирать нос.