Online Tutor For English
Idiom "back up"
back up: idiomatic verb
1. back up: to move backwards. Two cars backed up in the parking area so we can park in any one of them. (Two cars moved backward from their parking space so we can park in any of them.)
2. back up: to help or be ready to help. My son has joined the army to back up the Iraq War. I back up President Obama's policies in the Middle East.
3. back up: to move behind somebody or something. The shortstop backed up the second baseman on the throw. (The shortstop ran behind the second baseman to catch the throw if the second baseman missed it.)
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