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something or other; one thing or another; this or that
何だかだ言っても最終的には彼女の意見が通った。
Despite everything, her opinion prevailed in the end.
彼は何だかだ理由をつけて約束を守らないことが多い。
He often doesn't keep promises, making various excuses.
何だかだ忙しくて気づいたら一年が経っていた。
With one thing and another, I was busy and a year had passed before I knew it.