pit of stomach
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the pit of (one's) stomach
An area in the core of one's abdomen, approximately in or near one's stomach, in which one feels a physical response to strong emotion, especially fear, stress, or anxiety. I've had this awful feeling in the pit of my stomach all morning because I know we'll be finding out the results to the final exam this afternoon.
pit of one's stomach
Fig. the middle of one's stomach; the location of a "visceral response." I got a strange feeling in the pit of my stomach when they told me the bad news.