General Synonym:
* Torturing: This is a strong synonym, often used to describe extreme physical or mental pain.
Specific Synonym based on context:
* Storing: If you are talking about "racking" goods, this synonym means storing them in a specific way, like on shelves.
* Stretching: This synonym applies when you are "racking" your brain, meaning thinking hard and straining to remember something.
* Racking up: This synonym refers to accumulating something, like "racking up debt" or "racking up points" in a game.
* Twisting: If you are "racking" your body, this synonym means twisting it in a painful way, like from an injury.
* Wrenching: This synonym is similar to twisting, but it implies a forceful and violent action.
* Straining: This synonym implies a strenuous effort, such as "straining" to lift a heavy object.
Please provide more context about how you are using the word "racking," and I can give you a more precise synonym.