a dream come true
idiom.idiom. something that happens exactly as you hoped or imagined it would.
idiom. a figurative expression describing a long-desired event or situation that has finally materialized in reality.
Winning the lottery was a dream come true.
After years of practicing in her garage, getting a record deal was a dream come true for the young singer.
For the aging architect, seeing his final design dominate the city skyline was a dream come true that justified decades of professional struggle.
usually functions as a complement after the verb 'to be' or as a noun phrase in apposition.
point out the unusual grammar where 'come' is a past participle acting as an adjective; it is a fixed unit and cannot be changed to 'a dream came true' when used as a noun phrase.
It was a dream comes true.It was a dream come true.the phrase uses the past participle 'come' to describe the dream, not the present tense verb 'comes'.