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To swell or bulge outward. I hate these pants—they make my stomach pooch out in a really unflattering way. Unfortunately I had just gotten my wisdom teeth out the day before, so my cheeks are pooching out in every picture.
to stick or bulge out, as with a belly. His chubby tummy poached out when he relaxed.
To swell or protrude outward: I need to go on a diet—my stomach is starting to pooch out.