Meaning of 餅屋 in Japanese

Definition of 餅屋

もちや(mochiya) 【餅屋】

(n) rice cake shop keeper; rice cake store (shop)
餅屋は餅屋。
A specialist has his own strength.

もちはもちや(mochihamochiya) 【餠は餠屋 ·餅は餅屋 ·もちはもち屋】

(exp) every man knows his own business best; one should go to specialists for the best results

餅もちは餅屋もちや。

Every man to his trade.