分坐左右 Seated To Left And Right
今聞老爺大展三折之肱,治我一國之主,若主上病愈,老爺江山有分,我輩皆臣子也,禮當拜請。」行者見說,欣然登堂上坐;八戒、沙僧分坐左右。今闻老爷大展三折之肱,治我一国之主,若主上病愈,老爷江山有分,我辈皆臣子也,礼当拜请。」行者见说,欣然登堂上坐;八戒、沙僧分坐左右。
逐句解 Line by line
"Now I hear that your worship has displayed in full the arm broken three times, and is treating the lord of our whole kingdom. If His Majesty recovers, your worship will have a share in these rivers and hills, and we are all of us subjects — propriety requires that we kneel to invite you."
三折之肱 is a proverb: a man whose arm has been broken three times ends up a physician himself, because he has learned the trade the hard way. It is a compliment, and a slightly backhanded one. 分 is fèn here, an allotted share — the sense 康熙 files separately and glosses 名分也 — and not the fēn of dividing, which turns up in this very passage two lines down. 子 in 臣子 is the full zǐ of a compound noun, like 太子 or 弟子, not the light suffix zi of 銀子.
Hearing this, Pilgrim was pleased. He went up into the hall and took the seat of honour;
欣然 — pleased, and not troubling to hide it.
and Eight Rules and Sha the monk took their places to left and right of him.
分 is fēn now, to divide or take separately — the other reading of the character the steward just used for a share of a kingdom.
The steward states his calculation out loud: if the king recovers, this monk will end up with a share in the kingdom, and stewards are subjects. Deference is being paid forward against an expected result, and nobody in the room finds that remarkable.
Pilgrim's reaction settles how he takes it. He is pleased, goes straight up to the seat of honour, and has his brothers arranged on either side of him. The party turned away at this door in the morning is now sitting in state at it.