Questioned someone after an important event to get all the information and details about what happened.
From 'debrief,' combining 'de-' (reverse/undo) with 'brief,' suggesting the opposite of briefing someone. This military and intelligence term became standard in the 1940s-1950s.
Astronauts are extensively debriefed after every mission—NASA psychologists ask detailed questions to understand every sensation and observation, helping them learn about space and improve future missions.
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