The lowest parts or surfaces of something, or low-lying land near water bodies.
From Old English botm, related to Germanic words for 'ground' or 'foundation.' The geographical sense of fertile lowlands developed from the physical concept of lowest point.
River bottoms are among Earth's most fertile lands because flooding deposits nutrient-rich sediments - ancient civilizations thrived in these areas. The phrase 'bottoms up' reverses the natural order, celebrating the moment when the bottom becomes the top.
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