Definitions
to break off a military action with an enemy
Word origin
From the verb fall back.
Used in a sentence
“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.”
“As a fallback, I suppose we can use typewriters if the word processing system fails.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Reserve choice”8 letters
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