voice change; voice break
Refers to the deepening or cracking of the voice, typically during puberty. Often used interchangeably with 声変わり (こえがわり), which is more common in everyday speech.
See also: 声変わり
His voice deepened during his voice change period.
変声が始まると、声がかすれることがある。
When the voice change begins, the voice may become hoarse.
voice change period; puberty (age of voice change)
Compound of 変 (へん, 'change') and 声 (せい, 'voice').