fallback + noun
fallback 作形容词时只放在名词前，不能作表语，所以不说 The plan is fallback。
We always keep a fallback plan in case the deal falls through.
我们总是备一个后备方案，以防交易告吹。
可作为后备的；作为退路的。；退守的；应变的；[计] 撤退
That can be used as a backup or alternative when the primary option fails.
可作为后备的；作为退路的。
That can be resorted to as a fallback.
We have a fallback plan in case the main strategy fails.
我们有一个备用计划，以防主要策略失败。
用法提示：fallback作形容词，修饰plan，表示“备用的、应变的”。
The system automatically switches to a fallback server during maintenance.
系统在维护期间会自动切换到一个备用服务器。
用法提示：fallback作形容词，修饰server，表示“备用的”。
She always keeps a fallback option for her career path.
她总是为自己的职业道路保留一个替代方案。
用法提示：fallback作形容词，修饰option，表示“替代的、后备的”。
fallback 作形容词时只放在名词前，不能作表语，所以不说 The plan is fallback。
We always keep a fallback plan in case the deal falls through.
我们总是备一个后备方案，以防交易告吹。
介词 for 引出这个备用方案所针对的情形或对象。
The rescue team prepared a fallback route for flooded roads.
救援队为道路被淹的情况准备了一条备用路线。
grammar · medium
易错句子If the first plan fails, we will fallback to the second.
正确表达If the first plan fails, we will fall back to the second.
fallback 是形容词，不能当动词作谓语；表示“退到、求助于”的动词短语是 fall back，两个词分开写。
grammar · medium
易错句子We need fallback plan.
正确表达We need a fallback plan.
英语可数名词单数前通常要加冠词；汉语没有冠词，容易漏掉。fallback 作定语时，后面的 plan 是单数可数名词，所以要用 a。
backup 指事先准备好的替代品，原件丢失或损坏时直接顶上；fallback 则强调首选方案失败后才退而采用的最后选择。
standby 指随时可立即启用的人或设备，常用于服务、机票或应急；fallback 不强调随时待命，只表示不得已时的退路。
spare 指多出来的那一份实物，原物丢失或损坏时替换；fallback 指备用方案或退路，多用于计划、选择，而非实物。
fall + back
fallback + plan
fallback + option
fallback + position
Choose the next layer that will help you use fallback with more confidence.
Recommended next
Missing: Collocations
Complete this area with collocations.
Includes Context & register & Memory tip
Analyze the context and learn memory tricks to remember it.
More ways to explore
Includes Synonyms & Antonyms
Expand your vocabulary with synonyms and antonyms.
Includes Spelling & sound
Explore words with similar spelling endings or sounds.
Includes Word components & Thematic vocabulary
Learn how to build related words using roots, prefixes, and thematic clusters.
Includes Idioms & Cultural references
Discover idioms, slang, and famous pop culture quotes.
Dictionary facts from ECDICT, WIKTIONARY.