**Affair** — a situation or event, especially an interesting or unusual one.
Here are some examples of using the word «affair» in English:
1. I heard that there was some kind of scandalous affair involving a famous actor and a young model.
2. The company is currently dealing with a legal affair related to a breach of contract.
3. She decided to stay out of the family affair and not get involved in their arguments.
4. The local newspaper covered the entire affair in detail, reporting on every move of the suspects.
5. He tried to keep his extra-marital affair a secret, but eventually it came to light.
6. The affair between the two countries lasted for several years, but eventually they parted ways.
7. The teacher was shocked to find out that one of her students was involved in such a serious criminal affair.
8. The charity organization is currently fundraising for a new project to help children in need.
9. The whole affair was kept a secret until the very end, and then it all unfolded in a dramatic way.
10. The company's management decided to investigate the affair to find out what exactly happened.