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Related to rinse down: rinse off
rinse someone or something down
to wash or clean someone or something with water or other fluid. I rinsed him down for an hour and still didn't get the smell of skunk off him. I had to rinse down the driveway.
rinse something down (with something)
to wash something down one's throat with a liquid; to follow something that one has eaten with a drink to aid its going down. Alice rinsed the cheeseburger down with a milkshake. She rinsed down the sandwich with a drink.