What does the gesture mean in sign language to rub your flat hands together?

Rubbing your flat hands together in sign language doesn't have a specific meaning on its own. It's often used as a component of other signs, not as a standalone sign.

Here are some examples of how it's used:

* "Cold": You might rub your hands together to show the sensation of coldness.

* "Money": You might rub your hands together to show the action of exchanging money or the concept of wealth.

* "Nervous": You might rub your hands together to show a feeling of anxiety.

The context and the other signs you're using will determine the meaning of the gesture.

If you're learning sign language, it's important to learn the signs in their entirety, not just individual parts.