to question a witness very carefully during a court case, especially in order to show that they are not telling the truth:
• You will get a chance to cross-examine the witness when she has finished giving her evidence.
— cross-examination noun [uncountable] :
• He conceded under cross-examination that he did know about the letter.
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cross-examine UK US /ˌkrɒsɪgˈzæmɪn/ verb [T] LAW
► to ask someone detailed questions, especially in a law court, in order to discover if what they said earlier was true: »
Expert witnesses were cross-examined on their statements about how the accident had occurred.
cross-examination noun [C or U]
► »
Under cross-examination the witness admitted that she had been lying.
Financial and business terms. 2012.