APAD: Once bitten twice shy
移花接木
楼主 (文学城)
Once bitten twice shy.
A person won’t do something a second time because he/she had bad experience the first time.
Example: I won’t try this drink, because last time I had a burning sensation in my throat. Once bitten twice shy, I guess.
What to call if someone made the same mistake 3 times?
A ture idiot!