Jyutping
baak6 dou1 zi2 zeon3 ， hung4 dou1 zi2 ceot1
Pinyin
bái dāo zi jìn ， hóng dāo zi chū
Definitions (Wiktionary)
phrase, colloquial, idiomatic
to kill; to murder
劉雨菲從小到大從來沒見過殺人的場面，今天可是親眼看到了，那麼真切又那麼簡單，就像人放狠話的時候説的——白刀子進，紅刀子出。
刘雨菲从小到大从来没见过杀人的场面，今天可是亲眼看到了，那么真切又那么简单，就像人放狠话的时候说的——白刀子进，红刀子出。
liú yǔ fēi cóng xiǎo dào dà cóng lái méi jiàn guò shā rén de chǎng miàn ， jīn tiān kě shì qīn yǎn kàn dào le ， nà me zhēn qiè yòu nà me jiǎn dān ， jiù xiàng rén fàng hěn huà de shí hòu shuō de — bái dāo zi jìn ， hóng dāo zi chū ． Liu Yufei had never seen a murder his whole life, until today when he saw it with his own eyes. It happened so vividly, and yet so simply, like the ruthless saying, "The knife goes in white and comes out red."
Examples (Wiktionary)
Mandarin
刘雨菲从小到大从来没见过杀人的场面，今天可是亲眼看到了，那么真切又那么简单，就像人放狠话的时候说的——白刀子进，红刀子出。
劉雨菲從小到大從來沒見過殺人的場面，今天可是親眼看到了，那麼真切又那麼簡單，就像人放狠話的時候説的——白刀子進，紅刀子出。
liú yǔ fēi cóng xiǎo dào dà cóng lái méi jiàn guò shā rén de chǎng miàn ， jīn tiān kě shì qīn yǎn kàn dào le ， nà me zhēn qiè yòu nà me jiǎn dān ， jiù xiàng rén fàng hěn huà de shí hòu shuō de — bái dāo zi jìn ， hóng dāo zi chū ．
Liu Yufei had never seen a murder his whole life, until today when he saw it with his own eyes. It happened so vividly, and yet so simply, like the ruthless saying, "The knife goes in white and comes out red."