揉烏 もみえ帽子 ぼしであれば
momieboshideareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 揉烏帽子

1. If/when [one] rubs [the] *eboshi*…; If [one] were to rub [the] *eboshi*…

Ba Conditional