fallback
adjective [ before noun ] uk/ˈfɔːl.bæk/ us/ˈfɑːl.bæk/
（计划等）应变的，退一步的
A fallback plan or position can be used if other plans do not succeed or other things are not available.
Do we have a fallback position for these negotiations? 这些谈判我们有应变方案吗？