1. DILATE   contract   diversion   occupy   expand   concentrate   Hint Half-n-half Clue   2. AMASS   separate   collect   concentrate   concern   weightless   Half-n-half Clue   3. AMPLIFY   publicize   decrease   infer   belittle   increase   Half-n-half Clue   4. DILATORY   narrowing   prompt   refractory   portentous   expanding   Half-n-half Clue   5. CURTAIL   exchange   mutter   express   adapt   lengthen   Half-n-half Clue   6. AMICABLE   peaceful   unfriendly   beneficial   foolish   inescapable   Half-n-half Clue   7. CENTRIFUGAL   centripetal   central   distributed   algebraic   mercuric   Half-n-half Clue