when the water subsides the rock emerge,
the whole thing comes to light
辯論個水落石出argue the matter out
查個水落石出get to the bottom of a matter; investigate sth. thoroughly
弄個水落石出get to the bottom of the matter
她起了疑惑，便決定弄個水落石出。She got suspicious and decided to get to the bottom of it.
把事情爭個水落石出argue a matter out
他要是鉆壹個問題，就非鉆個水落石出不可。When he digs into a problem he does not give up until he gets to the bottom.
我壹定要把這事查個水落石出。I’ll be sure to investigate this matter thoroughly.