| 词汇 | a clean bill of health |
| 词源 | a clean bill of health. Used generally today this term has its origin in the document issued to a ship showing that the port it left was suffering from no epidemic or infection at the time of departure. Its antonym is a foul bill of health, both expressions dating back to the 18th century. |
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英语词源词典收录了13259条英语词源词条，基本涵盖了全部常用英语词汇的起源、历史，是研究英语词汇或通过词源学英语的必备工具。