The Allusion in Act 2 Scene 4 is the potion that refers to Cleopatra as a Gypsy girl. In this scene Mercutio means to describe Cleopatra by her tripartite nature:
In literature, an allusion is an inferred or indirect reference to a person, event, or thing.
The majority of allusions are founded on the premise that the writer and the audience have a common understanding which makes it easy for the reader to grasp the author's referent as a result.
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