swelled head
US /swɛld hɛd/
UK /swɛld hɛd/

1.
kiêu ngạo, tự mãn
a person who has an exaggerated opinion of their own importance, ability, or attractiveness
:
•
After winning the award, he got a bit of a swelled head.
Sau khi giành giải thưởng, anh ấy hơi kiêu ngạo.
•
Don't let success give you a swelled head.
Đừng để thành công khiến bạn kiêu ngạo.