classic waka stream

禊する水際に風の涼しきは
一夜をこめて秋や来ぬらむ
Roma-ji

Misogi suru migiwa ni kaze no suzushiki wa hitoyo o komete aki ya kinuramu

English Translation
Where they purify
at the water's edge, the wind
blows so cool and fresh,
has autumn within a single night
already come, I wonder
Meaning
The wind is cool at the water's edge where the purification rite is held. Could it be that autumn has arrived within this single night?
Commentary
Book Two Summer Poems 155

The wind at the water's edge where the summer's-end purification is held on the last day of the Sixth Month is cool, and the poet wonders whether autumn has arrived within this one night. In the rite of summer's final day he senses the air of the autumn that begins the next morning.
This is the closing poem of Book Two, Summer Poems. Where poem 94 at the head of the book began summer by mourning the spring that had passed, this poem closes the book sensing the autumn to come. It also echoes 'the wind alone has the look of autumn' in poem 153, ending the summer book with the motif of knowing autumn by the wind.

First line, 'misogi suru', means performing purification, here the Nagoshi rite held on the last day of the Sixth Month.
Second line, 'migiwa ni kaze no', is the wind at the water's edge, showing the coolness of the place of the rite.
Third line, 'suzushiki wa', means that it is cool, and the lower half surmises the reason.
Fourth line, 'hitoyo o komete', means within a single night, reflecting that autumn begins when the night of the summer's-end rite gives way to dawn.
Final line, 'aki ya kinuramu', binds the particle ya with the conjectural ramu, guessing whether autumn has come; nu is the perfective auxiliary.
Source
Kinyo Wakashu
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