"Big river"

Translation: Mto mkubwa

[philightentist]

How is Mto both Pillow and River?

[Gita-ji]

Why not? It is a simple word, so can have multiple meanings. And they are both longer than they are wide.

[Ne_cede_malis]

The history of that might be interesting. I suppose it's usually obvious which one is being referred to in the context of the conversation.