classic waka stream

柞散る岩間をかづく鴨鳥は
おのが青羽も紅葉しにけり
Roma-ji

Hahaso chiru iwama o kazuku kamodori wa ono ga aoba mo momiji shinikeri

English Translation
Where the oak leaves fall,
diving down among the rocks,
the wild duck too
has its own green feathers
turned the red of autumn leaves
Meaning
Diving among the rocks where the oak leaves fall, the wild duck has seen even its own green feathers turn autumn red.
Commentary
Book Three Autumn Poems 251

The duck diving into the water among the rocks, where fallen oak leaves float, has had even its green feathers dyed in autumn colors. The poem amusingly sees the duck, cloaked in red leaves, as if its own wings had turned.
Its final line, 'has turned to red', is the same as in poem 244 in this book and the next poem, 252, and it shares with the next poem the conceit that things other than trees, a duck's feathers and a valley bridge, turn crimson.
From poem 243 through poem 253 in this book come poems on autumn leaves, from trees just beginning to turn to leaves scattering until they fill rivers and waterfalls.

First line, 'hahaso chiru', uses hahaso, oaks such as the konara and kunugi, for their falling leaves.
Second line, 'iwama o kazuku', uses kazuku, to dive: diving into the water among the rocks.
Third line, 'kamodori wa', is the wild duck, placed as the subject.
Fourth line, 'ono ga aoba mo', means its own green feathers too, mo implying not just the leaves of the trees.
Final line, 'momiji shinikeri', means they have turned red, the same final line as poem 244 in this book and the next poem, 252.
Source
Kinyo Wakashu
Prev Poem
Yoso ni miru mine no momiji ya chirikuru to fumoto no sato wa arashi o zo matsu
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Ogurayama mine no arashi no fuku kara ni tani no kakehashi momiji shinikeri