揮淚斬馬謖

Simplified: 挥泪斩马谡

huīlèizhǎnmǎsù ㄏㄨㄟ ㄌㄟˋ ㄓㄢˇ ㄇㄚˇ ㄙㄨˋ

    • to punish a capable subordinate severely, despite personal pain, because rules demand it

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
weeping, execute Ma Su
Meaning
To punish a capable subordinate severely despite personal pain, because rules require it. From Zhuge Liang executing Ma Su after he lost Jieting.

Sources