Scrabble Dictionary

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Yes, debrief is playable

...and is worth 14 points.

Found in the following dictionaries

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SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Debrief" Definition

verb-transitive

To instruct (a government agent, for example) not to reveal classified or secret information after employment has ceased.
To question to obtain knowledge or intelligence gathered especially on a military mission.

verb

To interrogate (as a pilot) usually upon return (as from a mission) in order to obtain useful information.
To carefully review upon completion .