let something drop

If you want someone to drop the subject, drop it, or let it drop, you want them to stop talking about something, often because you are annoyed that they keep talking about it.
موضوعی را درز گرفتن، پایان دادن به ماجرا، قصه یا قائله ای، کوتاه کردن سخن برای جلوگیری از فاش شدن رازی.

let something drop/rest/lie
to stop talking about something
I think we’d better let the matter drop so your father can calm down.
Just let it rest, would you?
to stop talking about or trying to deal with something
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منابع

• https://www.macmillandictionary.com/dictionary/british/let-something-drop-rest• https://www.ldoceonline.com/dictionary/let-something-drop-rest-lie