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back up

to support; to make a copy

In Phrasal Verbs

In more detail

1. (verb) to move backwards

2. (verb) to support or help someone

3. (verb) to make a copy of computer files for safety

4. (verb) (phrasal verb) to accumulate or become blocked (used with 'up')

Examples

• 1. The car backed up slowly into the parking space.
• 2. My friends backed me up when I had an argument with my boss.
• 3. You should back up your important documents regularly.

How to use back up

Back up is a versatile phrasal verb with distinct meanings depending on context: physical movement (reverse a vehicle), interpersonal support (defend or assist someone), or data management (create copies). The noun form 'backup' is commonly used in all three senses. Choose this over synonyms when the sense of providing support or creating copies is intended.

Common phrases

• back up a claim
• back up traffic
• back up files
• back someone up
• back up slowly

Synonyms

reverse · retreat · support · corroborate · duplicate

Opposites

advance · proceed · undermine

Word family

backup · backer · backing

A common mistake

Learners sometimes write 'back-up' as a verb or single word 'backup' when a phrasal verb is needed; the correct form is 'back up' (two words) when used as a verb, though 'backup' or 'back-up' is correct as a noun or adjective.

Nearby in Phrasal Verbs

account for, bank on, break down, bring about

Keep going

How to remember the words you read · Spaced repetition, explained