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used informally and often ironically to add emphasis to a statement:
all his plays have such ridiculous plots — talk about good drama!
know what one is talking about,
to have thorough or specialized knowledge
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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