Hyperbole, is a figure of speech that uses extreme exaggeration to make a point or show emphasis. It is the opposite of understatement.
Example: 1. She’s as thin as a toothpick.
2. If I can’t get a smartphone, I will die.
An allusion is an expression designed to call something to mind without mentioning it explicitly; an indirect or passing reference.
Example: 1. “I was surprised his nose was not growing like Pinocchio’s.” This refers to the story of Pinocchio, where his nose grew whenever he told a lie. It is from The Adventures of Pinocchio, written by Carlo Collodi.
2. “He was a Good Samaritan yesterday when he helped the lady start her car.” This refers to the story of the Good Samaritan who was the only one to stop and help a man in need.