1. establish validity or prove genuine.   burnish   authenticate   disseminate   anneal   Hint Half-n-half Clue   2. weaken or make slender.   attenuate   coagulate   extrude   bifurcate   Half-n-half Clue   3. form into grains.   granulate   encipher   erode   dilute   Half-n-half Clue   4. calculate or reckon.   granulate   compute   dilute   converge   Half-n-half Clue   5. seal seams to make watertight.   impede   caulk   ignite   accelerate   Half-n-half Clue   6. spend winter sleeping.   eclipse   hibernate   contaminate   compound   Half-n-half Clue   7. force or thrust out.   impel   extrude   bifurcate   anneal   Half-n-half Clue