leave someone to their own devices
US /liːv ˈsʌm.wʌn tuː ðer oʊn dɪˈvaɪsɪz/
UK /liːv ˈsʌm.wʌn tuː ðer oʊn dɪˈvaɪsɪz/

1.
deixar alguém à vontade, deixar alguém fazer o que quiser
to allow someone to do what they want, without telling them what to do or trying to control them
:
•
If you leave him to his own devices, he'll probably just play video games all day.
Se você o deixar à vontade, ele provavelmente só vai jogar videogame o dia todo.
•
The children were left to their own devices while their parents were out.
As crianças foram deixadas à vontade enquanto os pais estavam fora.