Metalinguistic abstraction is when you use language to talk about language itself. This means you are not just talking about things in the world, but you are talking about the words you use to describe those things.
For example, if you were talking about the word "love" and what it means, you would be using metalinguistic abstraction. You are not talking about something physical like a toy or a tree, you are talking about a word and what it represents.
Another example is when you learn how to read and write. This involves using language to talk about language. You learn what letters and words are and how to use them to communicate. This is a very important skill because it helps you express your thoughts and ideas more clearly.
So, metalinguistic abstraction is like talking about talking, or language being used to understand language itself. It can help us understand how we use words and what they mean.