Voice breaking refers to the natural process when a person's voice becomes deeper and more mature during puberty. The high-pitched voice of a child starts to change, becoming lower and more adult-like. Full definition
«One more thing I have to thank him for,» he says, his rough voice breaking. (affidavit.art)
Reminds me of Hitler's voice breaking with emotion when he spoke of ridding Europe of Jews. (religion.blogs.cnn.com)
Barely a minute into the first webisode (each runs about eight minutes), Shelley?s voice breaks as she explains that she?s quitting for her daughters.? (canadianbusiness.com)