今日仇人 Today You Are An Enemy
牛王喝道：「你這個囔糟食的夯貨不見怎的，快叫那猴兒上來。」行者道：「不知好歹的䬲草！我昨日還與你論兄弟，今日就是仇人了。仔細吃吾一棒。」那牛王奮勇而迎。這場比前番更勝。牛王喝道：「你这个囔糟食的夯货不见怎的，快叫那猴儿上来。」行者道：「不知好歹的䬲草！我昨日还与你论兄弟，今日就是仇人了。仔细吃吾一棒。」那牛王奋勇而迎。这场比前番更胜。
逐句解 Line by line
The Bull King shouted: "You swill-stuffing lout are nothing to look at. Call that ape up here, and be quick."
The insult is chosen for the species: 囔糟食 is stuffing yourself with the dregs left over from brewing, which is what pigs were fed on. 喝 is hè, to shout, correctly reached here inside the frame 喝道; at other shouting sites in this chapter the drinking reading hē has to be corrected away. 猴兒 takes the full ér.
Pilgrim said: "You grass-gorging ox that knows neither good nor ill!
And here is the answering insult, chosen just as precisely. The character 䬲, in 䬲草, is the only one in this chapter from outside the common range, and it is a very exact abuse. 康熙 gives it at 集韻 居侯切, 音鉤 — gōu — and glosses it from 玉篇 as 牛飽也, an ox eating its fill. The word is lexically specific to cattle, which is why it answers the pig-specific 囔糟食 of the line before: each fighter abuses the other by what his animal eats.
"Yesterday I was still calling you brother; today you are an enemy. Look to yourself and taste my rod."
The sworn brotherhood ends here, formally, and he says so before striking. 還 is hái, "still", marking how recent the kinship was: yesterday, still brothers. 仔細 is zǐ xì, not the zǎi of 仔豬, a piglet. (一 shifts to yí in 一棒, before the falling tone of 棒.)
The Bull King roused his courage and met them.
奮勇而迎 is the same formula used of him at the end of the chapter's first exchange.
This bout was better than the one before.
The storyteller is setting up the poem that follows, and making a claim the reader can check: there have been two set-piece battle poems already in this chapter, and the third is announced as an improvement on both. 更 is gèng.
The two insults here are a matched pair, and each is chosen for the other's species. The Bull King calls Eight Rules a swill-stuffing lout, 囔糟食, which is what a pig is fed; the Great Sage answers with a character the dictionaries gloss as an ox eating its fill, and which exists for almost no other purpose. It is the chapter's only character from outside the common range, and it was chosen because nothing else would insult a bull so exactly.
我昨日還與你論兄弟，今日就是仇人了 is the formal end of the sworn brotherhood. The Great Sage invoked that kinship at the start of the sequence to ask for the fan, traded on it through two chapters of deception, and now closes it in one sentence with 還 marking how recent it was. Yesterday, still brothers.
這場比前番更勝 is the storyteller promising, and it is a promise the reader can check. Two set-piece battle poems have already been spent in this chapter, one in the air and one at night, and the third is announced as better than both before a line of it has been heard.