The noun fallback can refer to a reduction or decrease in something, for example, the figures have experienced a fallback since reaching their peak. A fallback can also refer to a backup plan or a Plan B that can be used when the original plan fails.

1. Pilots are required to have fallback plans in case of emergencies.
2. The soldiers were ordered to retreat to a fallback position.

1. Part of the Board Members' preparation for the negotiations was to create a fallback position.
2. If the weather does not hold up outdoors we have a second venue on standby as a fallback to host the event.