1. calculate or reckon.   anneal   impel   embed   compute   Hint Half-n-half Clue   2. intercept light or surpass.   dilute   coalesce   accelerate   eclipse   Half-n-half Clue   3. encode a message.   disperse   impede   generate   encipher   Half-n-half Clue   4. make impure by mixing with baser ingredients.   corrode   accelerate   adulterate   decant   Half-n-half Clue   5. eaten into or affected by chemical action.   embed   corrode   generate   disperse   Half-n-half Clue   6. seal seams to make watertight.   caulk   distill   converge   germinate   Half-n-half Clue   7. establish validity or prove genuine.   dehydrate   disseminate   germinate   authenticate   Half-n-half Clue