定要讓他 Make Sure She Takes It
他必然也要摘一個，你把紅的定要讓他。他若一口吃了，我卻在他肚裡，等我搗破他的皮袋，扯斷他的肝腸，弄死他，你就脫身了。」他必然也要摘一个，你把红的定要让他。他若一口吃了，我却在他肚里，等我捣破他的皮袋，扯断他的肝肠，弄死他，你就脱身了。」
逐句解 Line by line
"She will certainly want to pick one too — you must be sure to let her have the red one."
The whole plan rests on this sentence and it is a piece of etiquette. 讓 is to yield or offer politely, the ordinary courtesy of giving the better thing to your companion, and Pilgrim is weaponising good manners.
"If she swallows it at a mouthful, then I shall be inside her belly, and I will pound her leather bag open, tear her liver and bowels apart and kill her, and you will be free."
The stomach attack again, described in the same butcher's verbs as before. 皮袋 — the leather bag — is a dismissive word for a body, and the novel uses it of anything with a hide. 搗 is to pound as with a pestle.
The trap is baited with politeness. Tripitaka picks the red peach, then offers it to his hostess because that is what a guest does, and she takes it because refusing would be rude. Nothing in the plan requires her to be fooled — only to be well brought up.
It is the second time in this chapter that manners have been used as a tool. Pilgrim sent Bajie down the hill with a lecture on courtesy and got the whole plot out of two strangers; now he is using the same lever on the fiend herself.