The Japanese noun '所為 (せい)' means 'fault' or 'cause'. It is often used to indicate the reason or cause of a negative outcome, typically implying blame or responsibility. For example: It's your fault that we lost「私たちが負けたのは君の所為だ」(わたしたちがまけたのはきみのせいだ). The rain is the reason we couldn't go「雨の所為で行けなかった」(あめのせいでいけなかった). Note that '所為' is often used in a negative context and can carry a nuance of blame or responsibility for an undesirable situation.
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