to one's cost
成語所屬單字cost
to one's cost — 慣用語
1. used after verbs such as learn, discover, or know to mean 'through an unpleasant
1.慣用語
釋義
付出代價後才學到教訓；吃過虧才知道
used after verbs such as learn, discover, or know to mean 'through an unpleasant personal experience'.
例句
Tanvi learned to her cost that investing all her savings in one business was too risky.
Many travellers discover to their cost that cheap flights often hide extra fees.