What does Luke 24:18 mean?
Jesus has come upon two of His disciples who are talking about Him. As He approaches, He asks, "What is this conversation that you are holding with each other as you walk?" They don't recognize Him—the Holy Spirit is hiding His identity. But they're happy to talk (Luke 24:13–17).It's not clear if Cleopas's response is serious or if he's being dramatic for the sake of introducing a lively story. Even if he assumed this man did know of Jesus, Cleopas doesn't recognize Him, so He must not be a disciple. Cleopas and his friend are, so they would have more information than the average visitor.
Cleopas assumes Jesus is a visitor to Jerusalem because in that moment most people in the area were travelers. Friday was Passover. Saturday was the Sabbath and the first day of the Feast of Unleavened Bread, which is a holiday Sabbath. Jerusalem is filled with Jews who have traveled from across the Roman Empire to celebrate. But it's reasonable to assume that even if such a traveler heard about the crucifixion of an innocent man, they wouldn't necessarily know the backstory.
Cleopas invites Jesus to ask for more information. Then he goes into the story of the "prophet mighty in deed and word before God and all the people" (Luke 24:19). This is the man the Sanhedrin convinced the Romans to crucify. He is the same Man whom, according to the women of their group, has risen from the dead (Luke 24:20–24; Matthew 28:8–10).
Jesus lets Cleopas speak, then explains things from His point of view: that the Jewish Scriptures foretold these events long ago. It isn't until the men see Jesus break bread that they realize who He is (Luke 24:25–31).
Cleopas is short for the Greek name Cleopatros. Clopas seems to be the Semitic version, but we don't know if this Cleopas is the same as "the other Mary's" husband (John 19:25). We also don't know who Cleopas's companion is. There's a theory that it's the "Simon" of Luke 24:34 and the wording of the verse is awkward to the point of confusion, but 1 Corinthians 15:5 is strong evidence this "Simon" is Peter who is also known as Cephas.