birr¹ /bûr or bir/ (esp Scot and US)

1. Impetus, force, vigour
2. A violent push (Scot)
3. Emphasis, stress in speaking
4. Any sharp whirring sound

To whirr

• ethyl ether
• ethyl ethers
• ethyls
• ethyne
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• ETI
• e-ticket
• e-ticketing
• e-tickets
• et id genus omne
• etiolate
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• etna
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• Etnean