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1. To move or travel through (some place, thing, or space) on the way to some other place, thing, or space. I'm only passing through, so I won't get a chance to do anything as a tourist. I love passing through the lush forests in this region when I come back to visit my parents. A cold draft passed through the room when Jonathan opened the door.
2. To go through one's digestive tract and exit out through one's rectum. I had such a bad bought of diarrhea that any food or drink I swallowed passed right through me immediately. A: "Tommy just swallowed a nickel! What do we do?" B: "There's only one thing we can do—wait for it to pass through him."
pass through someone
to be digested through the bowels of someone. This fruit should pass through you in no time at all. He will be better when the offending food passes through him.
pass through something
to travel through something or some place. I passed through the countryside and breathed the good clean air. Perhaps I will stop and visit Joe the next time I pass through Adamsville.