leave someone to their own devices
US /liːv ˈsʌm.wʌn tuː ðer oʊn dɪˈvaɪsɪz/
UK /liːv ˈsʌm.wʌn tuː ðer oʊn dɪˈvaɪsɪz/
1.
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.
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The children were left to their own devices while their parents were out.