A verbal phrase whose meaning is purely figurative, such as "shake a leg" or "kick the bucket," is called what?

Name: A verbal phrase whose meaning is purely figurative, such as "shake a leg" or "kick the bucket," is called what?
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Idioms are figurative phrases that don't have a literal interpretation. They often have a cultural or historical context and are specific to a language. Examples include "break a leg" meaning good luck, or "bend over backwards" meaning to go to great lengths to help someone.

A Verbal Phrase Whose Meaning Is Purely Figurative, Such as "Shake