A backup plan or alternative option you can use if your first choice doesn't work or fails.
Compound word from 'fall' (to drop) and 'back' (retreat). Originally military terminology for a defensive position troops retreat to; evolved to mean any reserve strategy by the 20th century.
The concept of 'fallback' positions saved countless lives in warfare—generals learned that planning failures was as important as planning victories, a lesson that shaped modern project management and software design.
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