| 词汇 | doesn’t know his ass from his elbow |
| 词源 | doesn’t know his ass from his elbow. A common term de- scribing a person completely ignorant of something. In British slang it would be doesn’t know his arse from his elbow. |
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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。