From Longman Dictionary of Contemporary Englishbe a dab hand at/with somethingbe a dab hand at/with somethingBritish English informalGOOD AT to be very good at a particular activity → dab
Examples from the Corpus
be a dab hand at/with something• Workers at the Wellingborough factory are dab hands at turning out unusual orders.• However, they might be a dab hand at needlework or crochet.• She was a dab hand at couplets, was Rosie.• They should be dab hands with the diapers, and more in touch with their emotions. 