Learn English – Phrase for something that is always out or reach/you almost have but never can get

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I believe there is a two-word phrase for something that is always just out of reach for you and which you cannot ever seem to get. (It is not Tantalus or anything having to do with Tantalus, please).

It’s like a girl you like and want to date, and it almost happens a bunch of times but never materializes. You’d say, “She’s my __ __.”

I keep thinking dark horse, but that’s not it. Any help?

Best Answer

I can't think of a way to express that without borrowing from literature, so I would probably use 'Holy Grail'. When referring to something other than a girl, it'd probably be 'White Whale'.