(at) the end of the rainbow

/at ðɪ ˈɛnd ɒvðə ɹˈeɪnbəʊ/

/æt ðɪ ˈɛnd ʌvðə ɹˈeɪnboʊ/

used to refer to something that is extremely desirable yet nearly impossible to obtain

Examples

1. At the moment, finding a good plumber is like finding a pot of gold at the end of the rainbow.

2. At the moment, finding a good plumber is like finding a pot of gold at the end of the rainbow.

3. Repairing or regrowing damaged brain cells is the end of the rainbow for neuroscience research.

4. After such a long legal battle, we're just happy to know that there will be a bit of closure at the end of the rainbow.