Meaning: This sentence describes the way birds greet the world each morning. It's like saying,
Choice of Words: "Chirps" is the sound made by birds. "Greet" means to welcome or say hello. "Sleepy" means feeling the need to sleep. "World" is the earth and everything on it. "Dawn" is the first light of day. When you put it together, it means the sound of birds singing welcomes the world each morning.