know sb’s villainy fully; see through sb’s scheme (/treachery/tricks); see through the treacherous plot of
❍ 他～，揭穿了他们的阴谋。He saw through their schemes and laid them bare.
洞烛其奸dònɡ zhú qí jiān
烛：照亮。比喻看透某人的阴谋诡计。see through sb.’s treachery, look through sb.’s tricks, know sb.’s villainy fully