1. harden into bone or become rigid.   probe   pulverize   masticate   ossify   Hint Half-n-half Clue   2. multiply and spread.   implement   smolder   reverberate   propagate   Half-n-half Clue   3. melt ores for extraction of metal.   weather   initiate   incubate   smelt   Half-n-half Clue   4. introduce into a larger body or unite.   incorporate   invert   infer   perturb   Half-n-half Clue   5. release special substance or hide away.   ossify   inhibit   secrete   impinge   Half-n-half Clue   6. wet completely or soak with.   saturate   splice   pulverize   transpire   Half-n-half Clue   7. introduce or originate.   pulverize   initiate   infer   oscillate   Half-n-half Clue