too much of a good thing

US /tuː mʌtʃ əv ə ɡʊd θɪŋ/
UK /tuː mʌtʃ əv ə ɡʊd θɪŋ/
"too much of a good thing" picture
1.

demasiado de algo bueno, el exceso es malo

something that is enjoyable or beneficial but becomes harmful or unpleasant if there is an excessive amount of it

:
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Eating chocolate is nice, but too much of a good thing can make you sick.
Comer chocolate es agradable, pero demasiado de algo bueno puede enfermarte.
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Even a vacation can be too much of a good thing if it lasts for months.
Incluso unas vacaciones pueden ser demasiado de algo bueno si duran meses.