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

• portier
• portiest
• portigue
• portigues
• porting
• portion
• portioned
• portioner
• portioners
• portioning
• portionist
• portionists
• portionless
• portions
• portière
• portières
• portland
• Portland
• Portland arrowroot
• Portland cement
• Portlandian
• Portland sago
• Portland sheep
• Portland stone
• portlast