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じゃ なぜ

then why

→ では
phrase Rare #45,478
then why じゃ is a conversational form of では, meaning “then” or “well”; なぜ means “why.” The space is unusual in standard Japanese writing but is retained here as part of the requested term.
JA: じゃ なぜ彼に聞かなかったの？
EN: Then why didn't you ask him?

じゃなぜ文句を？

Then why complain?

— インディ・ジョーンズ／最後の聖戦 (1989)

じゃなぜ連れてきた？

Then why did you bring me here?

— セントラル・ステーション (1998)

ばかなじゃなぜ今まで…俺もそれを言った

Ridiculous. Then why all this time...? I said that too.

— Sanjuro (1962)

じゃなぜ私は入れた？

Then why did I put it in?

— レミーのおいしいレストラン (2007)