Wasurarete nageku tamoto o miru kara ni sa mo aranu sode no shiorenuru kana - Kinyo Wakashu(English Translation & Meaning)

忘られて嘆く袂を見るからに
さもあらぬ袖のしをれぬるかな

Roma-ji: Wasurarete nageku tamoto o miru kara ni sa mo aranu sode no shiorenuru kana
English Translation: As soon as I see
your sleeve wet with grief
at being forgotten,
even my sleeves, though not so,
have come to droop with tears
Meaning: As soon as I see your sleeve soaked with grief at being forgotten, even my own sleeve, though I am not in your plight, is drenched with tears.
Commentary: Book Nine Miscellaneous Poems I 560

As soon as the poet sees your tear-soaked sleeve as you grieve at being forgotten, even the poet's own sleeve, though not in such a plight, is drenched. The poem expresses sympathy for someone grieving at having been forgotten, and tears drawn by that sorrow.
Following poem 558, two poems before, which sang of blaming oneself when forgotten, this poem too takes the grief of being forgotten as its theme. It uses the same line, miru kara ni, as the third line of poem 552 in this book.

First line, 'wasurarete', means being forgotten, using the passive ru. It is the same word as wasurareshi in the fourth line of poem 558, two poems before.
Second line, 'nageku tamoto o', means your grieving sleeve, the sleeve wet with tears.
Third line, 'miru kara ni', means as soon as I see, the same line as the third line of poem 552 in this book.
Fourth line, 'sa mo aranu sode no', means my sleeve, which is not so, the sleeve of one who has not been forgotten. It pairs with tamoto in the second line.
Final line, 'shiorenuru kana', means how it has drooped, the attributive of the perfective nu with the exclamatory kana. Wet with tears, the sleeve is said to droop.
Source: Kinyo Wakashu
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