what if? Definition in the Cambridge English Dictionary
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Definition of “what if?” - English Dictionary

Definition of "what if" - American English Dictionary

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what if

used for ​asking what ​action to take if a ​particular thing should ​happen: What if ​ourplane is ​delayed and we can’t make the ​connection?
(Definition of what if from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "what if?" - British English Dictionary

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what if?

B1 used to ​ask about something that could ​happen in the ​future, ​especially something ​bad: What if the ​bus is late? What if you don't ​passyourexams?
(Definition of what if? from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "what-if" - Business English Dictionary

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what-ifnoun [C]

uk   us  
a ​question about what could ​happen or what could have ​happened in a particular ​situation if something was or had been different: a what-if question/scenario Stateagencies have until ​Sept. 30 to ​identify their "what-if" ​budgetcutscenarios.
(Definition of what-if from the Cambridge Business English Dictionary © Cambridge University Press)
Translations of “what if?”
in Chinese (Simplified) 如果(尤指糟糕的情况出现)会怎么样?…
in Chinese (Traditional) 如果(尤指糟糕的情況出現)會怎麼樣?…
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