have your cake and eat it (too)
US /hæv jʊər keɪk ænd iːt ɪt tuː/
UK /hæv jʊər keɪk ænd iːt ɪt tuː/

1.
ter tudo, querer o melhor dos dois mundos
to want or try to do two things that are impossible to do at the same time
:
•
You can't have your cake and eat it too; you need to choose between your career and your hobby.
Você não pode ter tudo; você precisa escolher entre sua carreira e seu hobby.
•
She wants to work full-time and also travel the world, but she can't have her cake and eat it too.
Ela quer trabalhar em tempo integral e também viajar pelo mundo, mas não pode ter tudo.