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substantiate

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verb [transitive] British English pronunciation: substantiate /səbˈstænʃieɪt/ 
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present tense
I/you/we/theysubstantiate
he/she/itsubstantiates
present participlesubstantiating
past tensesubstantiated
past participlesubstantiated
  1. to provide evidence that proves something

    They were unable to substantiate their claims of government malpractice.

derived word

substantiation

 British English pronunciation: substantiation /səbˌstænʃiˈeɪʃ(ə)n/  noun [uncountable]

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