To debrief is defined as to ask a series of questions about something that happened, such as a mission or an event that occurred.(verb)
When you interview a witness to a crime and ask a series of questions about what occurred, this is an example of a time when you debrief the witness.
See debrief in Webster's New World College Dictionary
Origin: de- + brief
See debrief in American Heritage Dictionary 4
transitive verb de·briefed, de·brief·ing, de·briefs
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