la sabelotodo
-the know-it-all
See the entry for sabelotodo.

sabelotodo

No te saldrás con la tuya por hacerte la sabelotodo.
You're not gonna get your way by being a wise guy.
Leí que la trama de Emma la humillación de la sabelotodo es la más popular que existe.
You know, I've read that the Emma plot, the humbling of the pretty, know-it-all girl is the most popular plot of all time.
Yo era la sabelotodo de la familia y tuve que renunciar a la idea de que un nuevo plan económico era la solución.
I was the know-it-all in my family, and I had to give up the idea that a new financial plan was the solution.
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