What does Jeremiah 32:1 mean?

This is what happened: In the tenth year of Zedekiah, king of Judah—which was the eighteenth year of Nebuchadnezzar’s reign—God spoke to Jeremiah. Jeremiah 32:1 - Modern Text Bible

(This verse sets the scene. It’s during the final years before Jerusalem falls to Babylon. Jeremiah is about to receive another message from God.)