verb (backs up, backing up, backed up, backed up)
- (intransitive) To move backwards, especially for a vehicle to do so
- (transitive) To move a vehicle backwards
- (intransitive) (Cricket) For the non striker to take a few steps down the pitch, in preparation to taking a run, just as the bowler bowls the ball.
- (intransitive) (Cricket) For a fielder to position himself behind the wicket (relative to a team-mate who is throwing the ball at the wicket) so as to stop the ball, and prevent overthrows.
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Full Definition of back up