Definition of 餅は餅屋 (もちはもちや)
もちもちや
                        餅は餅屋
もちはもちや
mochihamochiya
expression
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every man knows his own business best, one should go to specialists for the best results, for rice cakes, (go to) the rice cake shop(proverb)
See also:餅
Other readings:
                もちはもち屋【もちはもちや】
                Related Kanji
| 餅 | mochi rice cake | 
| 屋 | roof, house, shop, dealer, seller |