Definition of "fallback" in English

noun

1. An act of falling back.

   • A failure of one of the rocket's first-stage engines just after liftoff would result in a destructive pad fallback.
   • The black hole formed as a result of fallback of ejecta onto the neutron star initially created by the supernova explosion.

2. A backup plan or contingency strategy; an alternative which can be used if something goes wrong with the main plan; a recourse.

   • As a fallback, I suppose we can use typewriters if the word processing system fails.

3. (construction) A reduction in bitumen softening point, sometimes called refluxing or overheating, in a relatively closed container.

4. Pulverised material that falls back to earth after a nuclear explosion; fallout.

adjective

1. That can be resorted to as a fallback.

   • a fallback plan

verb

1. Misspelling of fall back.