https://en.wikipedia.org/wiki/Salad_days

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For other uses, see Salad Days (disambiguation).
"Salad days" is a Shakespearean idiomatic expression meaning a youthful time, accompanied by the inexperience, enthusiasm, idealism, innocence, or indiscretion that one associates with a young person. A more modern use, especially in the United States, refers to a heyday, a period when somebody was at the peak of their abilities—not necessarily in that person's youth. The quote "salad days" is from the Shakespearean play Antony and Cleopatra and is spoken in Act 1, Scene 5, by Cleopatra.

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*idiomatic  [ˌɪdiəˈmætɪk] 1. (언어 표현이 모국어 사용자가 쓰는 것같이) 자연스러운   2. 관용구가 든