know sb’s villainy fully; see through sb’s scheme (/treachery/tricks); see through the treacherous plot of
? 他～，揭穿了他們的陰謀。He saw through their schemes and laid them bare.
洞燭其奸dònɡ zhú qí jiān
燭：照亮。比喻看透某人的陰謀詭計。see through sb.’s treachery, look through sb.’s tricks, know sb.’s villainy fully