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substantiate

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verb [transitive] substantiate pronunciation in American English /səbˈstænʃiˌeɪt/ 
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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

 substantiate pronunciation in American English /səbˌstænʃiˈeɪʃ(ə)n/  noun [uncountable]

Open Dictionary

breakfast rave

a rave … that takes place early in the morning and where there is no alcohol or drugs …

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