Will o' the wisp American British noun
If you describe a hope or goal as a will-o'-the-wisp, you mean that it is impossible to reach.
The idea of dominating the orange juice market is a will-o'-the-wisp.
Some people think finding life on Mars will forever be a will-o'-the-wisp.
Used to describe someone that is illusory
Jenny is a will-o'-the-wisp when reckoning that she would be the best choice for the cheerleader position at the sports events this year.
To destroy someone's imagination, hallucination, or misbelief.
People tend to like forbidden or illegal things just because they are forbidden or illegal.
He must have believed that stolen fruit is the sweetest, and he, therefore, cheated on his partner.