What does 所為 mean?
所為 is a Japanese noun meaning “cause, reason, fault” in English. It is written as 所為 in kanji, せい in hiragana, and sei in romaji. This word is part of JLPT N3 vocabulary.
Example sentence
近所の人たちは皆その知らせに驚いた。
The whole neighborhood was surprised at the news.