on your own head be it

used to tell someone that they will have to take full responsibility for what they plan to do

At risk of being impertinent, if you make her head of the company, on your own head be it.

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have bigger fish to fry

To have other things to do, to have more important things to do, to have more interestings things to do.

I can't spend a lot of time on the problem. I have bigger fish to fry.

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