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noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru, intransitive verb
alternating between happiness and anxiety, swinging between joy and sorrow, being glad and sad by turns, oscillating between optimism and pessimism
yojijukugo-
彼は試合の結果に一喜一憂している。
He is now glad, now sad at the progress of the game.
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