| 词汇 | keel over |
| 词源 | keel over. To keel a boat is to roll her over on her keel; that is, to turn up the keel—the bottom of the boat—wrong side up- permost. This nautical practice and term led to the American- ism to keel over, first recorded in 1832, which meant “to turn a man or beast over on his back, to upset or capsize.” |
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