singing at the top of one's voice; loud singing
A yojijukugo describing unrestrained, loud singing, often with a sense of joyful abandon.
He got drunk and sang at the top of his voice.
I like to sing loudly on the mountaintop.
A yojijukugo composed of 高 (high), 歌 (song), 放 (release), and 吟 (recite/chant), literally meaning 'to sing loudly and freely'. The exact historical origin is uncertain.