quoin /koin/

1. A salient angle, esp of a building
2. A cornerstone, esp a dressed cornerstone
3. A keystone
4. A voussoir (qv)
5. A wedge, esp for locking type in a chase, or for raising a gun

1. To wedge
2. To secure or raise by wedging

quoinˈing noun

• countermeasures
• countermen
• countermine
• countermined
• countermines
• countermining
• countermotion
• countermotions
• countermove
• countermovement
• countermoves
• countermure
• countermured
• countermures
• countermuring
• counteroffensive
• counteroffer
• counteroffers
• counter-opening
• counterpace
• counterpaces
• counter-paled
• counterpane
• counterpanes
• counter-parole