General meaning:
* Brother/Sister: This is the most common meaning of "ndugu" and is used for both male and female siblings.
* Relative: "Ndugu" can also be used for any family member, including cousins, aunts, uncles, etc.
Specific meaning:
* Brother: When specifically referring to a male sibling, "ndugu" translates to brother.
* Sister: When specifically referring to a female sibling, "ndugu" translates to sister.
Other nuances:
* "Ndugu" can also be used as a term of endearment, similar to "friend" or "mate."
So, the best English translation of "ndugu" depends on the context and the specific meaning you want to convey.