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proof

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noun proof pronunciation in American English /pruf/ 
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singularproof
pluralproofs
 
  1. 1
    [countable/uncountable] information or evidence that shows that something is definitely true or definitely exists
    proof of:

    We were unable to establish proof of her innocence.

    Do you have any proof of identity (=a document such as a passport that proves who you are)?

    proof that:

    Do you have any proof that this is true?

  2. 3
    [countable] [usually plural] a copy of a book or article that someone reads and corrects before the final copy is made

    Whiskey that is 100 proof actually contains 50 % alcohol.

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sandwich generation

a generation … who are balancing working life with caring for both their teenage children and elderly parents

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