What does Judges 3:19 mean?

But when Ehud reached the stone carvings near Gilgal, he turned back and said, 'Your Majesty, I have a secret message for you.' The king told everyone to leave, so they were alone. Judges 3:19 - Modern Text Bible

(Ehud uses secrecy to get a private audience with Eglon, making the king curious and vulnerable.)