| 词汇 | ass-up |
| 词源 | ass-up. The unusually named small woodpecker of the family Sittidae, found in the eastern United States, is so called because it runs up and down tree trunks with its head held lower than its tail. |
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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。