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chestercat0
Idiom is the actual meaning of a word.

Metaphor is a comparison between two nouns without using like or as.

Allusion is a reference to a person, place, or thing.
saladsharks

Idiom:  an idiom is the use of words meaning one thing but meant to mean another thing.

Metaphor: the comparing of two unlike things using like or as.

Allusion: a reference to another work of art/literature.