一喜一憂
i-.kki.ichi.yuu
Literally: one – joy – one – sorrow/anxiety
Alternately: Alternating positve and negative feelings: joy and sorrow, hope and fear, cheerfulness and worry. Being unable to put one’s mind at ease. Mood swings. Extreme sensitivity to small changes in the situation.
So, uh, one girl’s mood is influenced by the day’s high temperature; the other’s, by the stock market. Source.
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