马后炮 (馬後炮) mǎ hòu pào

mǎ hòu pào set phrase firing after the horse
Domain: Literary Chinese 文言文
Notes: Figuratively, belated action; giving advice in hindsight (CC-CEDICT '馬後炮'; Guoyu '馬後炮')

Contained in

• 放马后炮(放馬後炮) to fire after the horse has bolted; to act too late to be effective