单词 | birr |
释义 | birr 1 (bûr) n. 1. A whirring sound. 2. Strong forward momentum; driving force. intr.v. birred, birr·ing, birrs To make a whirring sound. [Middle English bir, favorable wind, from Old Norse byrr; see bher-1 in the Appendix of Indo-European roots.] |
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