[gather|collect] dust

to be ignored or left unused for a very long time

The idiom "gather dust" originated from the concept of dust settling on objects that are left untouched or unused for an extended period. It is used figuratively to describe something that remains unused, neglected, or forgotten over time. The phrase implies that the item or idea is accumulating dust, both literally and metaphorically, due to lack of attention or relevance.

The old vinyl records in the attic have been gathering dust for decades, untouched and forgotten.
His artistic talents, once vibrant and celebrated, now collect dust as he pursues a corporate career.
The unfinished novel lay on the shelf, gathering dust, as the author struggled with writer's block.
The outdated computer equipment was left to collect dust in the storage room, replaced by newer models.
The abandoned project had great potential but ultimately collected dust as other priorities took precedence.