Longman Dictionary of Contemporary English homepage

fallback

 noun
     
fall‧back [countable]
something that can be used or done if a supply, method etc fails:
It's wise to have an extra video player as a fallback.
Do you have a fallback option?

➔ fall back on somebody/something

at fall1
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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