grist for the mill

US /ɡrɪst fɔr ðə mɪl/
UK /ɡrɪst fɔr ðə mɪl/
"grist for the mill" picture
1.

something that can be used to your advantage or to support an argument or cause

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All the criticism he received was just grist for the mill, making him work even harder.
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The politician used the recent scandal as grist for the mill in his campaign speech.
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millpepper millrun-of-the-millsteel millpaper millmill aroundgo through the mill