gamble (someone's) life away

Translations
поставить (чью-то) жизнь на кон
He decided to gamble his life away by taking unnecessary risks.
Он решил поставить свою жизнь на кон, принимая ненужные риски.
Definitions
To recklessly risk one's life or future by engaging in dangerous or irresponsible activities, often associated with excessive gambling or risky behavior.