Used when something abruptly stops working, especially mechanical or electronic gadgets.

Unexpected Failure

Avoid using 'conk out' for people failing tasks; it's for objects failing to function.

Not for People

Appropriate in informal conversations but may be too casual for formal writing.

Describes fast, unplanned transition into sleep, hinting at extreme tiredness.

Doesn't mean fainting or losing consciousness due to illness, it's just sleep from exhaustion.

Use 'conk out' with friends or family, but opt for 'fell asleep' in formal situations.