yī​zhāo​bèi​shé​yǎo​shí​nián​pà​jǐng​shéng

once bitten, twice shy

一朝被蛇咬,十年怕井绳 一朝被蛇咬,十年怕井繩 yī​zhāo​bèi​shé​yǎo​shí​nián​pà​jǐng​shéng
once bitten, twice shy
Literally "once bitten by a snake, for ten years one fears a well rope"; used to describe being overly cautious after a single traumatic experience.