if and when Meaning in the Cambridge English Dictionary Cambridge dictionaries logo

Meaning of “if and when” in the English Dictionary

"if and when" in British English

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if and when

mainly US (UK usually as and when) at the ​time that something ​happens: We don't own a ​car - we just ​rent one if and when we need it.
(Definition of if and when from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"if and when" in American English

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if and when

if: We’ll ​deal with that ​problem if and when it ​arises. Note: Used to emphasize that something is not likely to happen at all.
(Definition of if and when from the Cambridge Academic Content Dictionary © Cambridge University Press)
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