Etymology
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fallback

also fall-back, as a noun, "a reserve," 1851, from verbal phrase, from fall (v.) + back (adv.), which is attested in the sense of "retreat" from c. 1600. As an adjective, from 1767 as a type of chair; 1930 as "that may be used in an emergency."

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Definitions of fallback

fallback (n.)
to break off a military action with an enemy;
Synonyms: disengagement / pullout
From wordnet.princeton.edu