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ところでさ

by the way

→ ところで
phrase Rare #35,914
by the way An informal conversational phrase used to change the subject or bring up a new topic. The final さ adds a casual, attention-getting tone.
JA: ところでさ、明日の予定はどうなってる？
EN: By the way, what are your plans for tomorrow?

ところでさしょーちゃん

By the way, Sho-chan.

— 映画 聲の形 (2016)

ところでさキッチンであなたのファンに会った

By the way, I met one of your fans in the kitchen.

— 戦争と女の顔 (2019)

ところでさあの竜って野郎と君って何なの？

By the way, what are you to that dragon guy, anyway?

— AKIRA (1988)

ところでさマジでどっちが美人なの？

By the way, seriously, which one is prettier?

— アバウト・タイム ～愛おしい時間について～ (2013)

あ、ところでさ、君に見せたいものがあるんだ。

Oh, by the way, there's something I want to show you.