Samidare wa hikazu he ni keri azumaya no kaya ga nokiba no shita kutsuru made - Kinyo Wakashu(English Translation & Meaning)

五月雨は日数経にけり東屋の
萱が軒端の下朽つるまで

Roma-ji: Samidare wa hikazu he ni keri azumaya no kaya ga nokiba no shita kutsuru made
English Translation: The early summer rains
have gone on for many days,
until the thatched hut's
edges of its reedy eaves
are rotting from beneath
Meaning: The early summer rains have gone on for so many days that the underside of the thatched eaves of the rustic hut has begun to rot.
Commentary: Book Two Summer Poems 136

The early summer rains have fallen so long that the underside of the thatched eaves of a simple hut is rotting. The length of the unceasing rain is captured in the concrete image of the decaying eaves.
From poem 135 through poem 140 in this book come poems on the early summer rains, depicting how the long, unceasing rain swells the waters and sinks the landscape beneath them.

First line, 'samidare wa', opens by naming the theme.
Second line, 'hikazu he ni keri', means many days have passed, the perfective nu and exclamatory keri conveying sudden realization. The poem breaks after the second line, and the rest is inverted.
Third line, 'azumaya no', is a simple hut with only corner posts and no walls, a humble dwelling.
Fourth line, 'kaya ga nokiba no', is the edge of eaves thatched with reeds.
Final line, 'shita kutsuru made', means until the underside rots, showing how long the rain has lasted.
Source: Kinyo Wakashu
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