1. A bit for enlarging the upper part of a hole
   - counterbore, countersink

Derived forms: countersink bits

Type of: bit

• siree
• siren
• siren call
• siren song
• Sirenia
• sirenian
• sirenian mammal
• Sirenidae
• siriasis
• siris
• siris tree
• Sirius
• sirloin
• sirloin steak
• sirloin tip
• sirocco
• sirrah
• sirree
• sirup
• sis
• sisal
• sisal family
• sisal hemp
• sise
• sisham