fallback /ˈfɔːl.bæk/noun 4adjective 1forms 1 noun4 •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. •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. •Pulverised material that falls back to earth after a nuclear explosion; fallout.Particle size distributions of fallback and ejecta were determined principally by mechanical sieving and weighing. — 1970 •A reduction in bitumen softening point, sometimes called refluxing or overheating, in a relatively closed container. adjective1 •That can be resorted to as a fallback. formsfallbacks
