forbidden fruit

With reference to Genesis 2:17: ‘But of the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day that thou eatest thereof thou shalt surely die.’ (KJV)

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forbidden fruit (countable and uncountable, plural forbidden fruits)

1. (biblical) The fruit forbidden to Adam.
2. (idiomatic) Illicit pleasure.
3. Something desired that cannot be had.

   She was forbidden fruit because she's his teacher. This taboo made him want her even more

4. A small variety of shaddock (Citrus maxima), or sometimes other citrus fruits.

• forbidden fruit is the sweetest