make an ass of yourself
US /meɪk ən æs əv jərˈself/
UK /meɪk ən æs əv jərˈself/

1.
se ridiculiser, faire l'idiot
to behave in a very stupid or silly way that makes you look foolish
:
•
He tends to make an ass of himself when he drinks too much.
Il a tendance à se ridiculiser quand il boit trop.
•
I really made an ass of myself during the presentation.
Je me suis vraiment ridiculisé pendant la présentation.