搖席破坐 Breaking Up A Good Banquet
豬八戒道：「哥哥，你不達禮。這般御酒不吃，搖席破坐的，且去看甚麼哩？」國王聞說，情知八戒是為嘴，即命當駕官擡兩張素桌面看酒，在避妖樓外伺候。獃子卻才不嚷，同師父、沙僧笑道：「翻席去也。」猪八戒道：「哥哥，你不达礼。这般御酒不吃，摇席破坐的，且去看甚么哩？」国王闻说，情知八戒是为嘴，即命当驾官擡两张素桌面看酒，在避妖楼外伺候。呆子却才不嚷，同师父、沙僧笑道：「翻席去也。」
逐句解 Line by line
Pig Eight Rules said, "Brother, you have no manners.
達禮 is understanding what propriety requires — and it is Eight Rules raising the point, two passages after he laughed out loud at a kneeling emperor. 哥哥 takes the light second syllable.
"Leaving royal wine like this undrunk, breaking up the table and upsetting the seating — and going off to look at what?"
搖席破坐 — shaking the mat and breaking up the seating — is precisely the offence against a banquet that he has just accused his brother of not understanding. 甚 is shén, the question word, and 的 the light de.
Hearing him, the king understood at once that Eight Rules was speaking for his stomach. He ordered the officer of the day to carry two vegetarian tables of display wine out and set them waiting beside the Demon-Avoiding Tower.
情知 — knowing perfectly well — grants the king a shrewdness the chapter has not shown him before. He does not answer the objection; he sends the tables after them. 為 keeps wèi, on account of, and 當駕官 takes dāng, the officer on duty.
Only then did the idiot stop making a noise, and he said to his master and Sha the monk with a laugh, "We are moving the feast."
翻席 is to shift a banquet somewhere else, and he says it with evident satisfaction — a diplomatic crisis reclassified as a change of venue. 嚷 stays rǎng.
Eight Rules objects, and — of all people — he objects on grounds of manners. Royal wine left undrunk, the mat shaken, the seating broken up, and all to go and look at something. This is the same character who laughed out loud at a kneeling emperor a few minutes ago.
The king reads him instantly. Knowing perfectly well that he was speaking for his stomach is the shrewdest line anybody gives this king in the chapter, and he acts on it instead of answering it: two tables are carried out to wait beside the tower.
The objection is withdrawn the moment the tables follow. "We are moving the feast" is Eight Rules reclassifying a diplomatic crisis as a change of venue.