alternating between happiness and anxiety; swinging between joy and sorrow; being glad and sad by turns; oscillating between optimism and pessimism
結果に一喜一憂しても仕方がない。
There is no point in swinging between joy and anxiety over results.
株価に一喜一憂する日々が続いた。
Days of alternating joy and anxiety over stock prices continued.
試合の展開に一喜一憂した。
I alternated between joy and worry over the game's progress.