To make manifest, clear, evident.

And again he denied with an oath, I do not know the man. And after a while came unto him they that stood by, and said to Peter, Surely thou also art one of them; for thy speech BEWRAYETH thee. Then began he to curse and to swear, saying, I know not the man. And immediately the cock crew. ( Matthew 26:72-74 )

Dictionary of Words from the King James Bible. Public Domain. Copy freely.