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To move a vehicle backwards.

Additional definitions for 'back up':

back upAs a security measure.
back upTo move backwards, especially for a vehicle to do so.
back upTo provide support or the promise of support.
back upFor the non-striker to take a few steps down the pitch, in preparation to taking a run, just as the bowler bowls the ball.
back upSo as to stop the ball, and prevent overthrows.
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"back up." STANDS4 LLC, 2018. Web. 19 Sep. 2018. <>.

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