unsub
 n.— «Button Up and four other “unsubs”—FBI shorthand for “unknown subjects”—together are thought to be responsible for more than 30 robberies, nearly one-third of the bank robberies committed in Washington since January.» —“Button Up Bandit, others hitting banks at rapid pace” by Sara Jean Green Seattle Times (Washington) May 12, 2006. (source: Double-Tongued Dictionary)

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