* Piece, bit, or chunk: This is the most common meaning. For example, "thundu kazhi" would mean "a piece of cloth."
* Small, insignificant: It can also refer to something small or insignificant. For example, "oru thundu kaaryam" would mean "a small matter."
* Scrap, leftover: "Thundu" can also mean a scrap or leftover, like "thundu poo" which means "leftover food."
The exact meaning of "thundu" will depend on the context of the sentence.
Let me know if you have a specific sentence or phrase with "thundu" in it, and I can help you understand the meaning in that context!