to one's cost
idiomPart ofcost
to one's cost — idiom
1. used after verbs such as learn, discover, or know to mean 'through an unpleasant
1.idiom
Definition
used after verbs such as learn, discover, or know to mean 'through an unpleasant personal experience'.
Example
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.