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

• unfixities
• unfixity
• unflagging
• unflaggingly
• unflappabilities
• unflappability
• unflappable
• unflappably
• unflattering
• unflatteringly
• unflavoured
• unflawed
• unfledged
• unflesh
• unfleshed
• unfleshes
• unfleshing
• unfleshly
• unflinching
• unflinchingly
• unfloored
• unflush
• unflushed
• unflushes
• unflushing