What does the word chirp mean?

Usage examples for chirp

  1. But not a leaf stirred around us: the chirp of a cricket was sharply distinct in the stillness. – A Day Of Fate by E. P. Roe
  2. He had time for no more castle- building, for a startled robin flew away with a shrill chirp, and Christie looked up. – Work: A Story of Experience by Louisa May Alcott