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

• part-off
• part-offs
• part of speech
• parton
• partons
• partook
• part-owner
• part-owners
• part-payment
• part-payments
• partridge
• partridgeberries
• partridgeberry
• partridges
• partridge-wood
• parts
• part-singing
• part-song
• part-songs
• part-time
• part-timed
• part-timer
• part-timers
• part-times
• part-timing