不越雷池

not overstepping the prescribed limits / to remain within bounds

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

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