To get to the bottom of something
When you solve a mystery, you get to the bottom of it.
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Investigators are trying to get to the bottom of the mystery lung diseases among young e-cigarette users. When you “get to the bottom” of something, you solve a mystery or figure out a difficult problem. “I don’t know who stole my yogurt out of the refrigerator, but I’ll get to the bottom of the issue soon.”
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