"lost dream" is correct and usable in written English.
For example, you could use the sentence, "The lost dream of a peaceful future was demolished in an instant."
Now they are reminders of a lost dream.
Mr. Mitzna insists that his is not some quixotic invocation of a lost dream.
But without investing in youth now, it is in danger of becoming a lost dream".
The tears were shed for Willie Shaw's lost dream, which helped forge a path for David to get the head coaching job he never could.
The blazer, the tan, the lost dream of American entrepreneurship, her seduction and abandonment by transnational loins — these things hadn't killed her mother.
There must be a strong temptation to abandon Tibet as a lost dream and do as well as they can in the outside world.
Almost every note communicates emotional fragility and nostalgia for lost love, lost youth, lost dreams.
"They have dreams or they have lost dreams and they are looking for tools.
The city becomes a moralizing poem, its hidden realities and lost dreams teased out in new words.
Motifs bubble up – the detective shows, objects getting lost, dreams, a black coat – then disappear and resurface, to mesmerising effect.
Yet Ukrainians remember lost dreams of statehood during the two great European wars in the 20th century.
