What does the word allushion mean?

There's no word "allushion". It's likely a misspelling of "allusion".

Allusion is a literary device where an author or speaker makes an indirect reference to something else, such as a person, place, event, or work of art. This reference is usually brief and often left unexplained, relying on the audience's shared knowledge to understand its meaning.

Here are some examples of allusions:

* "He was a real Romeo with the ladies." (Refers to the romantic character Romeo from Shakespeare's play)

* "The boss is a real Scrooge." (Refers to the miserly character Ebenezer Scrooge from Charles Dickens's *A Christmas Carol*)

Let me know if you had something else in mind!