too big for your britches
US /tuː bɪɡ fɔːr jʊər ˈbrɪtʃɪz/
UK /tuː bɪɡ fɔːr jʊər ˈbrɪtʃɪz/
1.
se prendre trop au sérieux, avoir la grosse tête, être arrogant
acting in a way that shows you think you are more important or capable than you really are; arrogant or conceited
:
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Ever since he got that promotion, he's been acting too big for his britches.
Depuis qu'il a eu cette promotion, il se prend trop au sérieux.
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Don't get too big for your britches just because you won one game.
Ne te prends pas trop au sérieux juste parce que tu as gagné un match.