Meaning of “if and when” in the English Dictionary

American

"if and when" in 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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