打草驚蛇 Beating The Grass
行者見窟中無物,搴著棒,跑過來叫趕妖怪。那八戒聽得吆喝,自己害羞,忍著疼,爬起來,使鈀亂撲。行者見了,笑道:「妖怪走了,你還撲甚的了?」八戒道:「老豬在此打草驚蛇哩。」行者道:「活獃子,快趕上。」行者见窟中无物,搴着棒,跑过来叫赶妖怪。那八戒听得吆喝,自己害羞,忍着疼,爬起来,使钯乱扑。行者见了,笑道:「妖怪走了,你还扑甚的了?」八戒道:「老猪在此打草惊蛇哩。」行者道:「活呆子,快赶上。」
逐句解 Line by line
Pilgrim, finding nothing in the hole, hoisted his rod and came running over, calling to give chase.
搴 is to lift or raise. 著 is the marker zhe, and 中 is zhōng.
Hearing the shout, Eight Rules was ashamed of himself; he bore the pain, scrambled up and flailed about with his rake.
得 in 聽得 is the full verb dé, where the same character one segment earlier was the light particle. 喝 is hè, to shout — the reading it takes everywhere in this corpus except when somebody is drinking. 鈀 is fixed at pá.
Pilgrim saw it and laughed. "The demon has gone. What are you still swatting at?"
甚 is the question-word shén — automatic transcription gives the shèn that means "extremely" at this site. Three appearances of 了 in one short segment, all of them the completion marker.
Eight Rules said, "Old Pig is beating the grass to startle the snake."
Here is a genuine four-character idiom, and it is still in daily use: 打草驚蛇, "beat the grass and startle the snake," means to tip off your enemy by being clumsy — the exact sense of the English "you've shown your hand." Eight Rules is using it to dignify some pointless flailing, and the joke is that the snake in question is an actual snake, and it has already been startled.
Pilgrim said, "You perfect idiot. Come on, after him."
活 intensifies the noun after it — a downright, out-and-out idiot.
Eight Rules gets up because he has been shouted at, not because he has recovered, and the text says so plainly: 自己害羞, he was ashamed of himself. The flailing that follows is at nothing.
The proverb is the best line he is given in the chapter. Caught doing something pointless, he produces a four-character idiom that recasts it as strategy — and the idiom happens to be about snakes, which is what they are chasing. He is covering for himself and he is also, by pure accident, exactly on the subject.
It is his third proverb here. The first two were wrong about lanterns and rueful about a lost snake; this one is improvisation under embarrassment, and much the quickest of the three.