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KEY: Block.
SYN: Stop, arrest, fill, obstruct.
ANT: Free, liberate, open, pave.
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KEY: Blockhead.
SYN: Dolt, dunderhead, jolterhead, dunce, ninny, numskull, dullard, simpleton, booby, loggerhead, ignoramus.
ANT: Sage, adept, luminary, schoolman, philosopher, savant.
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KEY: Bloodshed.