英語候補someone who has become overly cautious due to a bad experience(person who is) once bitten twice shy
蛇に噛まれて朽ち縄に怖じるへびにかまれてくちなわにおじることわざ未分類once bitten twice shyto become over cautious from a bad experience
一世一代いっせいちだい四字熟語未分類once in a lifetimethe first and last occurrence (event, experience) of one's lifetime