Here are some possible interpretations and why they might be incorrect:
* Misheard or Mistyped Term: It's possible you've misheard or mistyped another term. It's important to check your sources or clarify the context.
* Specific Theoretical Framework: Perhaps "pivot grammar" is a term used within a specific theoretical framework of linguistics, but it's not widely recognized outside of that framework.
* Informal Usage: It's also possible that "pivot grammar" is an informal term used in a specific community or context.
To help me understand what you meant, could you please:
* Provide more context: Where did you hear this term? What was the conversation about?
* Give an example: If you have any examples of what "pivot grammar" might refer to, please share them.
With more information, I can better understand what you're asking and hopefully provide a more helpful answer.