Verb (5-dan, す, transitive)
1. to pass (the night); to spend
ここで一晩明かすんじゃないの?Aren't you going to spend the night here?
2. to reveal; to divulge; to disclose; to expose
これは話の中でまだ明かされていない。This has not yet been revealed in the story.
3. to prove; to verify