back up

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Definition
  1. Verb (transitive and intransitive):
    • To move or cause to move backwards: To reverse direction, especially in a vehicle, or to cause someone/something to retreat.
    • To provide support or confirmation: To give assistance, evidence, or moral support to a person, claim, or argument.
    • To make a duplicate copy for safekeeping: To create a security copy of digital data, such as computer files.
    • To become blocked or cause to become blocked: To accumulate and obstruct the flow, typically in a pipe, drain, or similar passage.
Examples of Usage
  • Verb (Move Backwards):
    • Please back up the car so I can open the gate.
    • The crowd was asked to back up to make room for the emergency vehicles.
  • Verb (Provide Support):
    • Her detailed research backs up her theory.
    • I will always back you up in the meeting.
  • Verb (Make a Copy):
    • It's crucial to back up your photos regularly.
    • The system is configured to back up files automatically every night.
  • Verb (Become Blocked):
    • The kitchen sink is backing up again.
    • Heavy rain caused the sewer lines to back up.
Advanced Usage
  • "to back up a claim/statement": To provide evidence or facts that support an assertion.
    • The journalist was required to back up her allegations with credible sources.
  • "to have someone's back (up)": An informal idiom meaning to be prepared to support or defend someone. (Note: This is a related idiom using "back," not the phrasal verb "back up").
    • Don't worry, I've got your back if there's any trouble.
Variants and Related Words
  • Backup (noun): A person or thing that provides support, or a reserve copy of data.
    • He is the backup quarterback.
    • Keep a backup of the document on an external drive.
  • Backup (adjective): Functioning as an alternative or reserve.
    • We need a backup plan.
Synonyms
  • Support: To assist or provide evidence for.
  • Reverse: To move backwards.
  • Copy/Duplicate: To make a reproduction of data.
  • Clog/Occlude: To block or obstruct.
Related Phrasal Verbs
  • Back down: To withdraw from a position or claim in an argument. (Note: This is a distinct phrasal verb).
    • After seeing the evidence, he was forced to back down.
  • Back off: To move away or to stop being involved, often to reduce pressure or aggression.
    • The dog growled, so I told the children to back off.
Related Idioms
  • Back up to the hilt: To support someone or something completely and without reservation.
    • The entire team backed up their manager to the hilt during the crisis.
Verb
  1. become or cause to become obstructed
    • The leaves clog our drains in the Fall
    • The water pipe is backed up
  2. make a copy of (a computer file) especially for storage in another place as a security copy
    • You'd better back up these files!
  3. establish as valid or genuine
    • Can you back up your claims?
  4. move backwards from a certain position
    • The bully had to back down
  5. give moral or psychological support, aid, or courage to
    • She supported him during the illness
    • Her children always backed her up

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