Related Clues:

• --- stone (unalterable)
• Take root
• Become established
• Not on the perimeter
• Work well together
• --- motion (begin)
• Plant firmly, using concrete perhaps
• Like some appliances or sleeves
• Become a colloid
• Become definite
• Became rampant
• Became widespread
• Begin, as winter
• Get set
• Become prevalent