З197
ЗУБЫ СЪЕСТЬ (ПРОЕСТЬ) на чём, в чём
highly coll ,
approvVPsubj:
humanpast only with resultative meaning
usu. this
WO to gain much experience, acquire substantial knowledge in some field through extensive practice
X зубы съел на Y-e - X knows Y inside out
X knows the tricks of the tradeX is an expert at (in) YX is a past master at YX knows a lot about YX knows his stuff (business, onions)(in limited contexts) X is an old hand (pro) at Y.