From the verb fall back.
fallback (plural fallbacks)
- An act of falling back.
- 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.
- (construction) A reduction in bitumen softening point, sometimes called refluxing or overheating in a relatively closed container.
an act of falling back
a backup plan
fallback (not comparable)
- That can be resorted to as a fallback.
- a fallback plan