simple past tense and past participle of fail fast

(astronomy) An event that ends the fusion lifetime of a large and massive star. It is a partial type-II supernova, where the collapse process occurs, but no significant rebound occurs, and the nascent black hole swallows the incoming implosion resulting in no outbound explosion or subsequent light burst.

simple past tense and past participle of words fail someone.

A condition characterized by chronic pain after back surgery.

(idiomatic) Certainly; by all means; as a matter of importance

Inevitably.

Describing a form of examination etc in which the student either passes or fails, without receiving a specific mark or grade.

A device, mechanism or measure designed to make something fail-safe.

That does not cause undue damage in the event of failure. / Designed to shut off for safety if an emergency occurs.

To compensate automatically, in the event of a failure. / To make a device or mechanism fail-safe, or to add a fail-safe device or mechanism to an existing system.