Iwama yuku yama no shitamizu sekiwabite morasu kokoro no hodo o shiranan - Senzai Wakashu(English Translation & Meaning)

岩間ゆく山の下水せきわびて
漏らす心のほどを知らなん

Roma-ji: Iwama yuku yama no shitamizu sekiwabite morasu kokoro no hodo o shiranan
English Translation: Like the hidden stream
flowing through the mountain rocks
that none can dam up,
know at least how deep the heart
that lets its secret seep away
Meaning: Like the hidden mountain stream that slips between the rocks and cannot be held back, my heart can no longer contain itself and lets its love leak out. I wish you would understand how deep it runs.
Commentary: Book Eleven Love Poems I 654

Headnote continued from the preceding poem: "Composed as a love poem when hundred-poem sequences were presented"
Like the preceding poem, a love poem from the Kyūan sequences. As the hidden mountain stream flowing among the rocks cannot be dammed and seeps away, she says, I wish you would know the depth of the heart that lets its love leak out. Likening her secret love to mountain water running unseen among the rocks, she hopes the one she loves will sense a feeling so deep that it can no longer be held in. The second line in the text reads "yama no shitamizu," which does not match "yamashitamizu o" in the line of kana readings; the text is followed here.
The author, "Hyōe of Jōsaimon'in," was the daughter of Minamoto no Akinaka, Head of the Office of Divinities. A younger sister of Taikenmon'in no Horikawa, she served Jōsaimon'in, Princess Muneko, a daughter of Emperor Toba.
The preceding poem, 653, is by her elder sister, so that two poems of love through water against rock stand side by side. It also shares with "tani no shitamizu" in 667 of this book the entrusting of a hidden love to unseen water.

First line, "iwama yuku": "flowing among the rocks." It answers "iwa ni kudakuru" in the second line of the preceding poem.
Second line, "yama no shitamizu": water that runs unseen beneath leaves or in the shade of rocks, a figure for secret love. It shares the image with "tani no shitamizu" in the last line of 667.
Third line, "sekiwabite": "seki" means to dam water, and "wabi" to be unable to do something, "unable to dam it up," overlaid with being unable to hold back love. It is akin to "sekikanete" in the third line of 697.
Fourth line, "morasu kokoro no": "of the heart that lets its love leak out," as water seeps through. Like "morasaba ya" in the first line of 680, it speaks of letting love out.
Fifth line, "hodo o shiranan": "hodo" means degree or depth, and "nan" is a final particle of wish directed at another, "I wish you would know."
Author: Jōsaimon'in no Hyōe
Source: Senzai Wakashu
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