expression, noun
forbidden fruit
Refers to something desirable but prohibited, often with a moral or tempting connotation. Originates from the biblical story of Adam and Eve.
彼にとって、彼女はまさに禁断の果実だった。
To him, she was truly the forbidden fruit.
禁断の果実に手を出すと、後悔することになるかもしれない。
If you reach for the forbidden fruit, you might end up regretting it.
A direct translation of the English phrase 'forbidden fruit', itself from the biblical account in Genesis. The Japanese expression is a calque, using 禁断 (prohibition) and 果実 (fruit).