Definition of expert witness in English:

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expert witness

noun

A person who is permitted to testify at a trial because of special knowledge or proficiency in a particular field that is relevant to the case: she was hired as an expert witness because she had assisted in more than 100 similar surgical procedures
More example sentences
  • An FBI expert witness testified that there was enough plastic explosive hidden in his shoes to blow a large hole in the airplane.
  • For reasons already given, I do not regard the evidence of either expert witness to be of primary assistance on this point.
  • He's also a forensic psychiatrist - one of those guys who testifies as an expert witness in court trials.

For editors and proofreaders

Syllabification: ex·pert wit·ness

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