back up

back up
back up
1. Lit. [for objects] to obstruct and accumulate in a pathway or channel. •

Something clogged the sewer and it backed up.

2. Fig. to refuse to go through with something; to back out (of something). •

Fred backed up at the last minute, leaving me to do the job alone.

* * *
{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 father is 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./

Dictionary of American idioms. 2013.

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