"Type erosion" is not a standard term in computer science or programming. It's possible that the term is being used in a specific context, but without more information, it's difficult to give a definitive answer.

Here are some possibilities of what the term could refer to:

* Loss of type information: This could happen in situations where type information is gradually lost during the execution of a program. For example, if a function accepts an argument of a generic type, and the function internally uses that argument in a way that doesn't require its specific type, the type information might be lost. This could lead to issues during type checking or runtime.

* Type weakening: This refers to a situation where a type is changed to a more general or less specific type. This can occur in type inference, where the compiler tries to deduce the type of a variable or expression. For example, if a function is called with an argument of type `int`, but the function accepts an argument of type `object`, the type of the argument is weakened to `object`.

* Type mismatch: This refers to a situation where a value of one type is used in a context that expects a value of a different type. This can lead to runtime errors or unexpected behavior.

If you can provide more context about where you encountered the term "type erosion," I might be able to give you a more specific answer.