Meaning of the word "have a swelled head" in English

What does "have a swelled head" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

have a swelled head

US /hæv ə swɛld hɛd/
UK /hæv ə swɛld hɛd/

Idiom

to become conceited or arrogant due to success or praise

Example:
After winning the championship, he started to have a swelled head.
Don't let success make you have a swelled head.