What does 1 Kings 18:7 mean?

As Obadiah was walking along, Elijah suddenly met him. Obadiah recognized him, bowed down, and said, 'Is that really you, Elijah, my master?' 1 Kings 18:7 - Modern Text Bible

(Obadiah unexpectedly runs into Elijah, whom he deeply respects and hasn’t seen in a long time.)