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

• befit
• befits
• befitted
• befitting
• befittingly
• be fizzing
• beflower
• beflowered
• beflowering
• beflowers
• beflum
• beflummed
• beflumming
• beflums
• befoam
• befoamed
• befoaming
• befoams
• befog
• befogged
• befogging
• befogs
• befool
• befooled
• befooling