だい霜降 そうこう枝尺 えだしゃくなら
daisō kōeda shakunara

Noun
Da Copula

The "-nara" conditional form ("if/when…") of 大霜降枝尺

1. If/when a heavy frost falls, branches will be a foot long.; If/when there is a heavy frost, branches will measure a foot.

Nara Conditional