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

1.
ترك شخصاً وشأنه, ترك شخصاً يفعل ما يشاء
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.
إذا تركته وشأنه، فمن المحتمل أن يلعب ألعاب الفيديو طوال اليوم.
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The children were left to their own devices while their parents were out.
تُرك الأطفال وشأنهم بينما كان والداهم بالخارج.