'big talker' definitions:
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agreeable rattle,
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babbler,
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blab,
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blabberer,
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blatherer,
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chatterbox,
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chatterer,
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gabber,
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gabbler,
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gasbag,
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gibble-gabbler,
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great talker,
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hot-air artist,
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idle chatterer,
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jabberer,
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jay,
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magpie,
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moulin a paroles,
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patterer,
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prater,
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prattler,
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rattle,
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windbag,
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windjammer,
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word-slinger