For Adynaton (Uh-dye-nuh-tahn) we have a term and definition in Poetry.

A type of hyperbole in which the exaggeration is magnified so greatly that it refers to an impossibility, e.g., "I'd walk a million miles for one of your smiles."
Sidelight: An adynaton can also be expressed negatively: "Not all the water in Lake Superior could satisfy his thirst."
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