**Relapse** (noun) — a return to a previous state of illness or bad habit after getting better or trying to overcome it.
Here are some examples of using the word **«relapse»** in English:
1. After months of strict diet and exercise, she had a relapse and started eating unhealthy food again.
2. The patient's condition seemed to be improving, but then he had a relapse and his health worsened.
3. He tried to quit smoking several times, but each time he had a relapse and started smoking again.
4. The company's financial situation was getting better, but then they had a relapse and lost a lot of money.
5. The patient was in remission for several years, but then had a relapse and the cancer returned.
6. She tried to overcome her addiction to alcohol, but had a relapse and went to a rehabilitation center.
7. After a long period of sobriety, he had a relapse and decided to seek help from a specialist.
8. The patient had a relapse of the disease and was hospitalized again.
9. After recovering from an injury, he had a relapse and had to start rehabilitation.
10. The patient's mental health was improving, but then she had a relapse and started feeling depressed again.