Never let it be said that I can't let sleeping dogs lie

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Thank you very much!

I don't understand "1" and I would like to know why she said "1".

No, never let it be said that I can't let the sleeping dogs lie.

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Have you seen the 2 links provided by the teacher? If not, check them. The answer is there. It's clear and there are examples about that saying's usage too.

If you read them and still not understand, then ask a again.