Iu koto no tagawanu mono ni aramaseba nochi uki koto to kikoezaramashi - Gosen Wakashu(English Translation & Meaning)

言ふ事のたがはぬものにあらませば
後憂き事と聞こえざらまし

Roma-ji: Iu koto no tagawanu mono ni aramaseba nochi uki koto to kikoezaramashi
English Translation: If the things we said
were things that never went astray,
then never would they
be heard of afterwards
as a bitter tale to tell
Meaning: If the words we spoke were things that never went astray, it would never have been told afterwards as a bitter tale.
Commentary: Book Seventeen Miscellaneous Poems III 1207

Headnote: "Hearing, after they had pledged themselves in words, that the other had gone to someone else."
The poet says that if spoken words never went astray, it would never have been told as a bitter tale afterwards. Hearing that the one who pledged to him has gone to another, he resents the emptiness of promises.
According to the headnote, it was composed on hearing that, after vows were exchanged in words, the other had gone over to someone else.
The poet is anonymous and the name is not known.

The first line, "Iu koto no," means "the things we said," the promises exchanged.
The second line, "tagawanu mono ni," means "things that never go astray."
The third line, "aramaseba," means "if they had been," with "maseba" a counterfactual condition answered by "mashi" in the last line.
The fourth line, "nochi uki koto to," means "afterwards as a bitter thing."
The last line, "kikoezaramashi," means "would never have been heard," answering the "maseba" of the third line.
Author: Unknown Poet
Source: Gosen Wakashu
Prev Poem: Shirakashi no yuki mo kienishi ashihiki no yamaji o tare ka fumimayou beki
Next Poem: Omokage o aimishi kazu ni nasu toki wa kokoro nomi koso shizumerarekere