The hacker used a back-door to get into the system.

The full back made a great tackle to stop the opposing team's attack.

I felt a rush of excitement as I jumped off the back of the boat.

We need to work back to the original plan after this failure.

I need to dial back my work hours to reduce stress.

I had to roll back the changes I made to the code.

If you want to become thin, you should cut back on the between-meal snacks.

Back in the days, people used to communicate through letters.