Formal:
* बड़ा भाई (baraa bhai): This is the most common and formal way to say "big brother."
Informal:
* भाई (bhai): This is a more casual and familiar way to say "brother." It can be used for both older and younger brothers.
* बड़ा (baraa): This is a very informal way to say "big brother," often used between close family members.
Other variations:
* बड़ा भैया (baraa bhaiya): This is a more affectionate way to say "big brother" and is often used by younger siblings.
* भैया (bhaiya): This is a more informal and friendly way to address an older brother.
The best way to choose the right phrase depends on your relationship with the person you're talking to and the level of formality you want to convey.