Yama samumi koromode usushi sarashina ya obasute no tsuki ni aki fukeshikaba

山寒み衣手薄し更級や
姥捨の月に秋更けしかば

Roma-ji: Yama samumi koromode usushi sarashina ya obasute no tsuki ni aki fukeshikaba
English Translation: The hills are so cold
that thin my sleeves feel to me—
Sarashina, ah!
by the moon of Obasute
since the autumn has grown late.
Meaning: The mountains are so cold my sleeves feel thin—for autumn has grown late under the moon of Obasute in Sarashina.
Commentary: Autumn Poems 285

Headnote continued from the preceding poem: "The autumn moon at famous places"
Because autumn has grown late under the moon of Obasute in Sarashina, the mountains are cold and the poet's sleeves feel thin. Gazing at the moon of a famous place, he feels the cold of deepening autumn on his skin.

Line 1, yama samumi, means "since the mountains are cold," with mi on an adjective stem giving the reason.
Line 2 means "my sleeves are thin," and the poem pauses here. Against "my sleeves are cold" in the preceding poem, 284, this poem says "thin," singing the same sensation of the sleeves now as cold, now as thin.
Line 3 is the same as line 3 of the preceding poem.
Line 4, "by the moon of Obasute," is hypermetric.
Line 5 means "since autumn has grown late," with shika the evaluative of the past ki and ba giving the cause; through inversion it gives last the reason for the cold. The three poems on the autumn moon at famous places close with the lateness of autumn.
Author: Minamoto no Sanetomo
Source: Kinkaishu
Prev Poem: Tsuki mireba koromode samushi sarashina ya obasuteyama no mine no akikaze
Next Poem: Hisakata no tsuki no hikari shi kiyokereba aki no nakaba o sora ni shiru kana