What does Exodus 4:14 mean?

Then the LORD got angry with Moses and said, 'What about your brother Aaron the Levite? I know he can speak well. He’s already on his way to meet you, and he’ll be happy to see you.' Exodus 4:14 - Modern Text Bible

(God is frustrated with Moses’ reluctance, but provides a solution: Aaron, Moses’ brother, will help by speaking for him.)