不敢越雷池一步

dare not go one step beyond the prescribed limit

no; not so / (bound form) not; un-

to dare / daring / (polite) may I venture

generic word for peoples or states of south China or south Asia at different historical periods / abbr. for Vietnam 越南

to exceed / to climb over / to surpass / the more... the more

surname Lei

thunder / mine (weapon) / (Internet slang) terrifying / terrific

thunder / (bound form) (military) mine, as in 地雷[di4 lei2] land mine / (coll.) to shock; to stun; to astound / (Tw) (coll.) spoiler / (Tw) (coll.) to reveal plot details to (sb)

pond / reservoir / moat

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

surname Bu

a step / a pace / walk / march / stages in a process / situation