1. Butterfly: This is the most common meaning of "thumbi." It refers to a butterfly, especially a small, colorful one.
2. A type of flower: There is a type of flower called "Thumbi Poo" in Tamil, which is the Indian paintbrush (Cassia auriculata).
3. A small, delicate thing: "Thumbi" can also be used figuratively to describe something small and delicate, similar to a butterfly or the "Thumbi Poo" flower.
4. A name: "Thumbi" is also a common name for girls in Tamil culture.
To understand the exact meaning of "thumbi" in a particular context, you would need to consider the surrounding words and the overall meaning of the sentence or phrase.