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During the Spring and Autumn period, King Zhuang of Chu waged war against the State of Song because Song had executed Chu's envoy, Shen Zhou.
Chu's army laid siege to the capital of Song for half a year, intending to continue the encirclement indefinitely. The people of Song were in great distress.
Their king dispatched Marshal Hua Yuan, who bravely infiltrated the bedroom of Chu's Marshal Zi Fan.
Hua Yuan confronted Zi Fan, declaring that the people of Song, facing extreme starvation, would rather resort to exchanging their children for food and burning human bones for fuel than surrender to Chu.

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Open the tool →易子而食 (yì zǐ ér shí) is a Chinese idiom (chengyu) meaning “to exchange children for food”.
易子而食 is pronounced yì zǐ ér shí in Mandarin Chinese.
Literally, 易子而食 means “exchange children and eat”. It is used to mean “to exchange children for food”.
易子而食 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
子:指儿女。原指春秋时宋国被围,城内粮尽,百姓交换子女以当食物。后形容灾民极其悲惨的生活。