To come full of anticipation or enthusiasm, but leave feeling disappointed or disillusioned; to arrive with high hopes only to depart with regret.
他原以为这次旅行会非常精彩，没想到却乘兴而来，败兴而返，因为天气一直不好，影响了所有计划。
He originally thought this trip would be wonderful, but unexpectedly, he came in high spirits and returned in disappointment, because the weather was consistently bad, affecting all the plans.
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