Commonly confused
Back up vs Back down
“Back up” and “Back down” look alike but pull in different directions. Here is the quick way to tell them apart — with examples, the mistake to avoid, and a check.
Which one do you mean?
Up means support or copy; down means retreat. Back up means support someone or save a copy; back down means stop arguing and give way.
Back up
Support someone, copy your data, or reverse a vehicle.
Back down
Withdraw from a position, demand, or argument.
back up
- 1
Make a digital copy of data as a safeguard
- 2
Support someone's claim, story or position
- 3
Move backward along the same path
Correct use
“Back up your files before the update.”
Make copies of your files in case the originals are lost.
back down
- 1
Withdraw from a position
Correct use
“He refused to back down from the argument.”
He refused to retreat from his position in the argument.
Common mistake
He refused to back up from his demand.
He refused to back down from his demand.
To stop insisting, use back down.
Test yourself
“Back up your files before the update.” What does it mean?
Follow the pattern
Continue through the matching verb family and particle guides.
Sink In — iOS & Android
Stop mixing them up
Sink In turns confusable pairs like this into quick contrast drills, so the right particle becomes automatic instead of a guess.
- Learn the pattern behind dozens of verbs at once — not one-off translations.
- Spaced repetition (SM-2) brings each meaning back right before you forget.
- Four practice modes train recall and discrimination, not just recognition.
