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corroborate

corroborate - verb

  1. To present evidence in support of: back(up), buttress, substantiate. See support.
  2. To assure the certainty or validity of: attest, authenticate, back(up), bear out, confirm, evidence, justify, substantiate, testify(to), validate, verify, warrant. See support. true.
  3. To establish as true or genuine: authenticate, bear out, confirm, demonstrate, endorse, establish, evidence, prove, show, substantiate, validate, verify. See show. support.