Move or drive a vehicle backward, as in He told her to back up into the garage . [First half of 1800s]

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Bring or come to a standstill, as in The water had backed up in the drains , or The accident had backed up traffic for miles . [First half of 1800s]

"},{"id":"4effa20080539d285834ff50","ordinal":3,"source":"american-heritage","text":"

Support or strengthen, as in The photos were backed up with heavy cardboard so they couldn't be bent , or I'll back up that statement of yours . [Second half of 1700s]

"},{"id":"4effa20080539d285834ff51","ordinal":4,"source":"american-heritage","text":"

Duplicate a file or program so that the original is not lost. For example, Every computer manual warns you to back up your work frequently in case of a power outage or computer failure . [Second half of 1900s]

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back up

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