- That can be resorted to as a fallback.
"a fallback plan"
- (construction) A reduction in bitumen softening point, sometimes called refluxing or overheating in a relatively closed container.
- 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."
- An act of falling back.