Misabi inu ike no omote no kiyokereba yadoreru tsuki mo meyasukarikeri

水錆ゐぬ池の面の清ければ
宿れる月もめやすかりけり

Roma-ji: Misabi inu ike no omote no kiyokereba yadoreru tsuki mo meyasukarikeri
English Translation: Since the pond's surface,
where no rust of water floats,
lies so pure and clear,
the moon that is lodged therein
is a pleasant sight as well.
Meaning: Since the surface of the pond lies clear, with no film of water rust upon it, the moon that is mirrored there is lovely to see as well.
Commentary: Autumn Poems 320

Headnote: "The moon over a pond"
The topic is the moon reflected on a pond. A pond with no film of water rust on its surface is clear, and so the moon reflected in it is pleasing and lovely to look at. The purity of the pond is linked to the beauty of the moon reflected there.
The next two poems take up the same topic, and in 322 the cloud over the moon is likened to water rust left unswept, answering misabi inu in this poem.

First line, “misabi inu”: misabi is a rust-like film floating on water, and inu means not lying on it.
Second line, “ike no omote no”: of the surface of the pond.
Third line, “kiyokereba”: since it is clear, the perfective form with ba stating a settled condition.
Fourth line, “yadoreru tsuki mo”: yadoru is to be reflected and remain, and ru is the attributive of the continuative ri.
Fifth line, “meyasukarikeri”: meyasushi means pleasant to the eye, and keri expresses realization.
Author: Saigyō
Source: Sankashu
Prev Poem: Kiyomigata tsuki sumu sora no ukigumo wa Fuji no takane no keburi narikeri
Next Poem: Yadoshi motsu tsuki no hikari no ooshisa wa ika ni iedomo Hirosawa no ike