grist for (one's) mill(redirected from grist for her mill)
grist for (one's) mill
Something that initially seems bad or negative but is ultimately used in a positive way by someone. A: "The tabloids found out that you've been in rehab. How do you plan on handling it?" B: "It's just grist for my mill—I'm a changed man now, and that's what I'll tell the media. At least they're writing about me again!"