それは単なる手落ちだ。
Sentence Analyzer
English Translation
It was simply an oversight.
Furigana
それは単 なる手落 ちだ。
Romanji
Sore wa tannaru teochi da.
Words
其れ
(それ)
that (indicating an item or person near the listener, the action of the listener, or something on their mind); it; that time; then; there (indicating a place near the listener); you
は
(は)
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
単なる
(たんなる)
mere; simple; sheer
手落ち
(ておち)
oversight; omission
だ
(だ)
be; is; indicates past or completed action; indicates light imperative