What is the noun form of shrink?

The noun form of "shrink" can be shrinkage, which refers to the act or process of shrinking.

However, depending on the context, you might also use:

* Shrinker: This is a less common noun, usually referring to a person or machine that shrinks something.

* Shrink: In some cases, you can directly use "shrink" as a noun, particularly when referring to a psychologist or psychiatrist.

Let me know if you have a specific context in mind, and I can help you determine the most appropriate noun form!