Mishi yume no omoiideraruru yoigoto ni iwanu o shiru wa namida narikeri - Gosen Wakashu(English Translation & Meaning)

見し夢の思ひ出でらるる宵ごとに
言はぬを知るは涙なりけり

Roma-ji: Mishi yume no omoiideraruru yoigoto ni iwanu o shiru wa namida narikeri
English Translation: Each evening that brings
the dream I once saw
back into my mind,
the one who knows what I don't say
is no one but my tears
Meaning: Every evening when the dream I once dreamed comes back to me, it is only my tears that know what I leave unsaid.
Commentary: Book Twelve Love Poems IV 825

Headnote: "Perhaps there was something on her mind."
The poet says that every evening when the dream she once had comes back to her, the only one who knows what she leaves unsaid is her tears. Saying that only tears know the love she confides to no one, she sings of the pain of a hidden love.
According to the headnote, the poem was perhaps composed when she had something weighing on her heart. Like 813 and 814 in this book, it closes with "namida narikeri."
The poet, Ise, was a daughter of Fujiwara no Tsugukage. She served Empress Onshi, consort of Emperor Uda, and received Uda's favor. Later she bore Nakatsukasa to Prince Atsuyoshi. She is one of the Thirty-Six Poetic Immortals.

The first line, "Mishi yume no," means "the dream I saw," likely a dream of meeting the beloved.
The second line, "omoiideraruru," means "comes back to mind of itself," "raruru" being the attributive of the spontaneous auxiliary "raru."
The third line, "yoigoto ni," means "each evening."
The fourth line, "iwanu o shiru wa," means "the one who knows what I do not say." 866 in this book also sings of an unspoken love with "iwanedomo."
The last line, "namida narikeri," means "is my tears," the same last line as 813 and 814 in this book.
Author: Ise
Source: Gosen Wakashu
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