Definition of 所で
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(conj) by the way; incidentally
「ところでよ、そのおめーのおとうさんはどこにいんのさ?」「横転したトラックの下なんよ。」
"By the way, where's your old man?" "Under that over-turned truck." - even if; no matter (who, what, when, where, why, how)