a plan or method that you use if another one fails, or is likely to fail
The alternative Plan B for funding the stadium calls for a contribution of $7.5 million a year from taxpayers for 30 years.
Having a plan B is advisable in case unforeseen challenges arise during the project.
As a backup plan, the event organizers secured an indoor venue in case of inclement weather.
Wise travelers always have a plan B for accommodations in case their initial arrangements fall through.
Entrepreneurs often develop a plan B to pivot their business strategy based on market changes.