burn one's fingers

burn one's fingers  {v. phr.},  {informal}
To get in trouble doing something and fear to do it again; learn caution through an unpleasant experience.
He had burned his fingers in the stock market once, and didn't want to try again.
Some people can't be told; they have to burn their fingers to learn.
Categories: experience informal verb
Source: A Dictionary of American Idioms

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