1. past tense and past participle of birr; to make a whirring sound
Usage: often used to describe the sound of wings or machinery
2. past tense and past participle of birr; to move with speed and energy
Usage: informal

Examples

• The hummingbird's wings birred as it hovered near the flower.
• The motor birred to life when she turned the key.
• He birred past us on his bicycle without stopping.
• The drone birred overhead, surveying the landscape.
• The machine birred loudly in the factory.
• She birred through the hallway, late for class.