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A person skilled in a particular activity; an expert: a dab hand at gardening.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
informal Brit a person who is particularly skilled at something; expert: a dab hand at chess.
[C17: perhaps from dab1 (vb)]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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noun (Brit. informal) expert, master, ace (informal), buff (informal), wizard, adept, whizz (informal), boffin (Brit. informal), hotshot (informal), past master, maven (U.S.), fundi (S. African), dabster (dialect) She was a dab hand at solving difficult puzzles.
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.