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

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

She knows better than to answer back to him.

The hiker carried the heavy backpack on his back all day.

The popular item is finally back in stock!

I felt like he stabbed me in the back when he revealed my secret.

She is practicing the back crawl in the swimming pool.

There is no going back once you have pressed the button.

She performed a perfect back dive.

I finally found the back number of that magazine.