(as) proud as a peacock
US /əz praʊd əz ə ˈpiːkɑk/
UK /əz praʊd əz ə ˈpiːkɑk/

1.
fiero come un pavone, molto orgoglioso
very proud of oneself, often in a way that is considered arrogant or boastful
:
•
After winning the competition, he was as proud as a peacock.
Dopo aver vinto la competizione, era fiero come un pavone.
•
She walked onto the stage, as proud as a peacock, to accept her award.
Salì sul palco, fiera come un pavone, per accettare il suo premio.