Here are some possibilities for what the word might mean:
* Doubling: This is the most likely option, meaning to increase something by two, or to make something twice as large.
* Dubbing: This means to add a new soundtrack or dialogue to a film or video, usually in a different language.
* Dubbing (slang): This could be slang for copying or replicating something, especially in a quick or informal way.
To understand what "dubbling" means, you'll need more context.
Can you tell me:
* Where did you see or hear the word "dubbling"?
* What was the sentence or phrase it was used in?
With more information, I can give you a more precise answer.