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back off
back office
back out
back pain
back pass
back passage
back pay
back pressure
back projection
back row
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back-seat driver
back shift
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back-story
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back projection
back pro·jec·tion


noun 
Definition:
 
projecting film as background: the cinematic technique of projecting a film onto a translucent screen from behind, usually to provide a moving background against which other action can be filmed
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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