Kawariyuku kagami no kage o miru tabi ni Oiso no mori no nageki o zo suru - Kinyo Wakashu(English Translation & Meaning)

変はりゆく鏡の影を見るたびに
おいその森の嘆きをぞする

Roma-ji: Kawariyuku kagami no kage o miru tabi ni Oiso no mori no nageki o zo suru
English Translation: Every time I see
my image in the mirror
changing as it ages,
like the Wood of Oiso there
I sigh with the grief of years
Meaning: Each time I see my reflection changing in the mirror, I sigh the sighs of old age, like the Forest of Oiso true to its name.
Commentary: Book Nine Miscellaneous Poems I 599

Each time the poet sees the face in the mirror changing with the years, he sighs the sigh of old age, like the name of the Forest of Oiso. Overlaying his aging reflection with the name of the famous Oiso Forest, he laments growing old.
Poem 579 in this book also sings of a mirror and the image within it. Where 579 sang of a clouded mirror that shows nothing, this poem sings of a mirror that shows age all too clearly.

First line, 'kawariyuku', means changing, the face declining with the years.
Second line, 'kagami no kage o', means the image in the mirror, echoing masukagami and utsureru kage in poem 579 in this book.
Third line, 'miru tabi ni', means each time I see.
Fourth line, 'Oiso no mori no', is a pivot in which oiso joins the Oiso Forest, a famous place in Ōmi, and oi, old age, left in kana.
Final line, 'nageki o zo suru', means I sigh, the ki of nageki echoing ki, tree, of the forest. The particle zo is answered by the attributive suru.
Source: Kinyo Wakashu
Prev Poem: Itazura ni suguru tsukihi o kazoureba mukashi o shinobu ne koso nakarure
Next Poem: Koyurugi no isogite aishi kai mo naku nami yori kosu to kiku wa makoto ka