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plan B

noun
1.
a strategy or plan to be implemented if the original one proves impracticable or unsuccessful.
Also, Plan B.
Origin
1975-1980
1975-80; from the assumption that the original plan is ‘plan A’
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Contemporary definitions for plan B
noun

a secondary plan of action in the event that changes would make the primary plan unsuccessful

Examples

Plan B is to move in one year or seven years from now.

Dictionary.com's 21st Century Lexicon
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