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[back up] {v.}
1. To move backwards.
The train was backing up.
2. To help or be ready to
help; stay behind to help; agree with and speak in support of.
Jim has joined
the Boy Scouts and his fatheris backing him up.
The principal backs up the
faculty.
Jim told us what had happened and Bob backed him up.
Compare: BACK
OF(3), STAND BY(4).
3. To move behind (another fielder) in order to catch the ball
if he misses it.
The shortstop backed up the second baseman on the
throw.
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