See more synonyms for fallback on Thesaurus.com
  1. an act or instance of falling back.
  2. something or someone to turn or return to, especially for help or as an alternative: His teaching experience would be a fallback if the business failed.
  1. Also fall-back. of or designating something kept in reserve or as an alternative: The negotiators agreed on a fallback position.

Origin of fallback

1750–60, Americanism; noun, adj. use of verb phrase fall back
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for fallback

also fall-back; 1767 as a type of chair; 1930 as "a position to be used in an emergency;" from fall (v.) + back (adv.).

Online Etymology Dictionary, © 2010 Douglas Harper