Formal:
* বিদায় (Biday): This is the most formal way to say goodbye.
* আপনাকে ভালো থাকুন (Apnake valo thakun): This translates to "May you stay well" and is a polite way to say goodbye.
Informal:
* বিদায় (Biday): This is also used informally, but it's more common to use the following:
* শুভ রাত্রি (Shubh Ratri): This means "good night."
* ভালো থাকো (Valo thako): This means "stay well" and is used for friends and family.
* আবার দেখা হবে (Abar Dekha Hobe): This means "See you again."
* চলে যাচ্ছি (Chole jaচ্ছি): This means "I am leaving."
For a close friend or family member:
* খোশ থাকো (Khos Thako): This means "Be happy."
The best way to say goodbye in Bengali depends on the situation and your relationship with the person.