support[transitive usually passive]
to support someone or something, especially by giving them money or using your influence:
The scheme has been backed by several major companies in the region.
Some suspected that the rebellion was backed and financed by the US.
b) also back up
to support an idea by providing facts, proof etc:
His claims are not backed by any scientific evidence.
to move backwards, or make someone or something move backwards
move backwards[intransitive always + adverb/preposition, transitive]
back into/out of/away from etc
She backed into a doorway to let the crowds pass by.
back somebody into/towards/out of etc something
He began to back her towards the open door.
back something into/towards/out of etc something
I backed the car into the garage.
to put a material or substance onto the back of something, in order to protect it or make it stronger:
put something on the back[transitive usually passive]
Back the photo with cardboard.
a plastic-backed shower curtain
to be at the back of something or behind it:
be behind something[transitive usually passive]
The Jandia Peninsula is a stretch of white sands backed by a mountain range.
to play or sing the music that supports the main singer or musician:
music[transitive usually passive]APM
They performed all their hits, backed by a 40-piece orchestra.
to risk money on whether a particular horse, dog, team etc wins something
to support someone or something that is not successful
back awayphrasal verb
to move backwards and away from something, especially because you are frightened
back away from
She backed away from the menacing look on his face.
to stop supporting a plan or idea, or stop being involved in something
back away from
The government has backed away from its nuclear weapons strategy.
back downphrasal verb
Both sides have refused to back down.
back offphrasal verb
to move backwards, away from someone or something:
She backed off and then turned and ran.
to stop telling someone what to do, or stop criticizing them, especially so that they can deal with something themselves:
I think you should back off for a while.
Back off, Marc! Let me run my own life!
to stop supporting something, or decide not to do something you were planning to do:
Jerry backed off when he realized how much work was involved.
back off from
The company has backed off from investing new money.
back onto somethingphrasal verb
The hotel backs onto St Mark's Square.
back outphrasal verb
It's too late to back out now.
After you've signed the contract, it will be impossible to back out.
back out of
The government is trying to back out of its commitment to reduce pollution.
back upphrasal verb
to say or show that what someone is saying is true:
Jane would back me up if she were here.
There's no evidence to back up his accusations.
These theories have not been backed up by research.
to provide support or help for someone or something: ➔ backup
back somebody/something ↔ up
The plan's success depends on how vigorously the UN will back it up with action.
The police officers are backed up by extra teams of people at the weekend.
to make a copy of information stored on a computer:
Make sure you back up.
back something ↔ up
These devices can back up the whole system.
back something ↔ up onto something➔ backup
Back all your files up onto floppy disks.
4TTC especially American English
to make a vehicle move backwards:
The truck stopped and then backed up.
back something ↔ up
I backed the car up a little.
to move backwards: ➔ backup
Back up a bit so that everyone can see.
if traffic backs up, it forms a long line of vehicles that cannot move:
The traffic was starting to back up in both directions.
if a toilet, sink etc backs up, it becomes blocked so that water cannot flow out of it