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Chinese dictionary
n.derog(a Chinese chess term used figuratively to mean) belated action or advice; second guess
他这个建议也许是马后炮。
It's probably already too late for his suggestion to do any good.
放马后炮
be a Monday morning quarterback
考试都结束了,你才说帮我复习功课,这岂不是马后炮吗?
You come and offer to help with my lessons only after the examination. Isn't that a bit too late?
他总是用他的马后炮打我的老将。
He always caught my general with his cannon behind his knight.
放马后炮太容易了。
It’s very easy to be wise after the event.