An idiom is a phrase or expression whose meaning cannot be understood from the literal definitions of its words. It has a figurative or non-literal meaning, often stemming from cultural or historical contexts. Learning idioms can significantly improve fluency and understanding of a language, especially English, where they are commonly used – Google
https://www.ef.com/wwen/english-resources/english-idioms/
A Blessing in Disguise
Kill Two Birds with one stone
Break a Leg
Hit the Sack