What is the meaning of thumb-long?

"Thumb-long" is a descriptive term that refers to something that is approximately the length of a person's thumb.

It is often used in informal contexts to give a general sense of size, especially when describing small objects.

For example:

* "The nail was only thumb-long, so it wasn't very dangerous."

* "I found a thumb-long piece of wood that would be perfect for a toothpick."

Note: The actual length of a thumb can vary between individuals, so "thumb-long" is not a precise measurement.