This translates more to "say the word brother"
It should be something like "ongea" which means speak or talk or "jibu" if you want an answer or "itika" - of you want a response
*itika - if you want a response
According to my tanzanian husband "kusema" is more formal and relates to a speach. In this context it would be more approprioate to use "kuongea"
That makes me think of the Lord of the Rings. I think there is no translation yet.
Let's start one here:
Why not Say, brother!