"English in English" essentially means "English written or spoken in the English language." It might sound redundant, but it can be used to emphasize that something is indeed in English and not another language. For instance, if someone asked you to translate a text from Spanish to English, you would be translating it into "English in English."

To illustrate this concept further, let's imagine you're attending an international conference where various languages are spoken. You might hear someone say, "Could you please provide the presentation in English in English?" This statement is emphasizing that they want the content in English, without any foreign accents or colloquialisms that might make comprehension difficult for non-native speakers.

Moreover, "English in English" could also refer to a situation where a piece of writing or speech needs to be translated into English from another language. For example, if a book is originally written in French, and it is being translated into English, we can say that the final product will be "English in English."

In summary, while the phrase "English in English" may seem repetitive, it serves a purpose in clarifying the language of communication, especially in contexts where clarity and precision are crucial.