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

1.
iemand zijn eigen gang laten gaan, iemand aan zijn lot overlaten
to allow someone to do what they want, without telling them what to do or trying to control them
:
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If you leave him to his own devices, he'll probably just play video games all day.
Als je hem zijn eigen gang laat gaan, zal hij waarschijnlijk de hele dag videogames spelen.
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The children were left to their own devices while their parents were out.
De kinderen werden aan hun lot overgelaten terwijl hun ouders weg waren.