After a few weeks of healthy eating, it's easy to slip back into old, unhealthy habits.

She is harking back to her childhood memories.

She harked back to her childhood memories.

I found a hidden door in the back room.

There are many talented back-rappers in the music industry.

He is a talented back-rapper.

He backed off when he realized he was wrong.

He is backing off from the argument.

Back when I was a child, we used to play outside all day.

I remember back when we used to play in the park every day.