Corroborate means to confirm and make more certain the substantiating testimony of a witness or a party at a trial. It is best understood in the context of supporting evidence. Cases such as this one from Alabama explain that “corroborate means to strengthen, to make stronger; not the proof of any particular fact to which the witness has testified, but to strengthen the probative, criminating force of his testimony.”
[Last updated in June of 2021 by the Wex Definitions Team]