back tooth
back tooth

back up


Definition: Meaning of, back up in English to English dictionary.

Pronunciation: / bak ʌp /

  • phrasal verb
  • synonym
  • antonym
Word Forms:
Prsesent Past Past Participle
back up backed up backed up
Present Participle Third Person Singular
backing up backs up
  1. [transitive] back someone up to give support to someone by telling other people that you agree with them
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  2. [transitive] to show that an explanation or belief is probably true
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  3. [intransitive/transitive] to make a copy of information on your computer
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  4. [intransitive/transitive] if traffic backs up, or if it is backed up, the vehicles are in a long line and waiting to continue moving
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  5. if a toilet, sink, or drain backs up, or if it is backed up, water cannot flow through it because something is blocking it
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  6. if a system backs up, or if it is backed up, it has slowed down or stopped working because there is too much of something for it to deal with
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  7. [intransitive] to move backwards a short distance
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  8. [intransitive/transitive] to make a car go backwards
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  9. [intransitive] mainly American English used for telling someone to return to something that was said earlier
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