Double back
Definition 1 of 2
Pro Tip 1/3Physical action
Used when someone literally turns around and goes back where they came from. 
After passing the library, she had to double back when she remembered her book was due.
Pro Tip 2/3Missed Item
Often used when forgetting something and needing to return to the original location. 
I doubled back home for my passport.
Pro Tip 3/3New Decision
Reflects a change of mind, leading to a return to a previous point. 
We decided to double back to the first design after seeing the final product.