所為
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Noun meaning cause, reason, or fault. Often used in the pattern 『~の所為で』 (~no sei de, 'because of ~ / Due to ~') to indicate blame or causation. Example: 『雨の所為で試合が中止になった』 (Ame no sei de shiai ga chūshi ni natta, 'The match was canceled due to the rain').
Theme

Two friends, Ken and User, are discussing a recent project failure at work, trying to figure out what went wrong.

所為

せい

cause, reason, fault

Advanced ExpansionAbstract Concepts

Memory Hook

Think of 'sewi' (せい) as 'say why' — when something goes wrong, you 'say why' it happened, pointing to the cause or fault. 'Say why' → 所為 (sewi, 'cause, reason, fault').

Cultural Note

『所為』 (sewi) is often used in expressions like 『私の所為です』 (Watashi no sei desu, 'It's my fault'), showing responsibility or blame in social interactions.

Forms

Base: 所為Noun meaning cause, reason, or fault. Often used in the pattern 『~の所為で』 (~no sei de, 'because of ~ / Due to ~') to indicate blame or causation. Example: 『雨の所為で試合が中止になった』 (Ame no sei de shiai ga chūshi ni natta, 'The match was canceled due to the rain').