唱個喏 A Bow And A Salutation
那老者起身道：「才聞得你說會拿妖怪，我這裡卻有個妖怪，累你替我們拿拿，自有重謝。」行者就朝上唱個喏道：「承照顧了。」那老者起身道：「才闻得你说会拿妖怪，我这里却有个妖怪，累你替我们拿拿，自有重谢。」行者就朝上唱个喏道：「承照顾了。」
逐句解 Line by line
The old man rose to his feet and said, "I heard you say just now that you can catch demons. As it happens, we have a demon here. If I might trouble you to catch it on our behalf, there will be a proper reward."
Here 得 is the full verb dé, "to get," the pattern this chapter also uses in 聽得, "heard." 累 is lèi, to put someone to trouble — the polite verb for asking a favour. The doubled 拿拿 makes the request sound casual, as though catching a demon were a small errand.
Pilgrim promptly made a bow towards him with the salutation that goes with it, and said, "Much obliged for the custom."
喏 is rě, not the nuò of assent that automatic transcription supplies — 唱喏 is the bow with a cry that went with it, a Song and Ming greeting, and the reading is pinned across the corpus. 朝 is cháo, facing towards.
The old man stands up to ask, which is the first thing he has done standing since he opened the gate. The request has been the point of the entire evening and he gets it out in one sentence, with the reward tacked onto the end.
Pilgrim's response is not an acceptance. 承照顧了 — "much obliged for the custom" — is shopkeeper's language, what a tradesman says when an order comes in, and the bow that goes with it belongs behind a counter rather than on the road. He has answered a plea for help as though it were a piece of business.