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To move backwards, especially for a vehicle to do so.

Additional definitions for 'back up':

back upAs a security measure.
back upTo move a vehicle backwards.
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." Phrases.net. STANDS4 LLC, 2017. Web. 20 Nov. 2017. <http://www.phrases.net/phrase/back-up_51>.

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