
Know/learn/find something to your cost
Negative Outcome
The phrase implies you'll discover a truth through a bad experience.

He didn't take the warnings seriously and found the risks to his cost.
Personal Experience
It must be something personally experienced, not witnessed or heard.

She skipped studying and learned the material's difficulty to her cost.
Emotional Weight
The phrase often carries emotional weight, hinting at regret or a tough lesson.

They cut corners on the construction and knew their mistake to their cost.
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