conk out
phrasal verb with conk verb [ T ] informal humorous uk/kɒŋk/ us/kɑːŋk/
informal
（车辆或其他机器）突然出故障，停止运转，突然失灵
If vehicles and other machines conk out, they stop working or fail suddenly.
I was just two miles from home when my motorbike conked out! 我出门刚骑了两英里，我的摩托车就突然出了故障！
倒头睡去;突然不省人事
to go to sleep very quickly, or to suddenly become unconscious
After a six-hour flight and a long day of meetings, it's not surprising you conked out. 坐了6个小时的飞机，又开了一天的会，难怪你倒头就睡着了。