go to someone's head

US /ɡoʊ tə ˈsʌm.wʌnz hɛd/
UK /ɡoʊ tə ˈsʌm.wʌnz hɛd/
"go to someone's head" picture
1.

if success or praise goes to someone's head, it makes them feel more important than they really are

:
Don't let that small victory go to your head.
After winning the award, his ego really started to go to his head.