What does the idiom "a flash in the pan" mean?

• The idiom "a flash in the pan" means A sudden short-lived success.

• A flash in the pan
English Meaning:
1. A sudden success that ends quickly and is unlikely to happen again
2. A thing or person whose sudden but brief success is not repeated or repeatable.
3. A sudden success that lasts only a short time and is not likely to be repeated.
Bangla Meaning:
- যে প্রচেষ্টা প্রায় শুরুতেই ব্যর্থতায় পর্যবসিত হয় বা চিরতরে খতম হয়ে যায়।

• Examples:
- Beene’s new novel proves he isn’t just a flash in the pan.
- Sadly, their success was just a flash in the pan.
- He needed to prove that his success was not just a flash in the pan.

Source: 
1. Longman Dictionary.
2. Cambridge Dictionary.
3. Oxford Learner's Dictionary.
4. Accessible Dictionary by Bangla Academy.