informal a person who is particularly skilled at something; expert
a dab hand at chess
English Collins Dictionary - English Definition & Thesaurus
ace (informal) adept, buff (informal) dabster (dialect) expert, hotshot (informal) maven (U.S.) past master, whizz (informal) wizard
English Collins Dictionary - English synonyms & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"