わり にわとり牛刀 ぎゅうとうなら
wariniwatorigyū tōnara

Noun
Da Copula

The "-nara" conditional form ("if/when…") of 割鶏牛刀

1. If (one) were to slaughter a chicken with an ox-cleaver; If (it) were a chicken-slaughtering ox-cleaver

Nara Conditional