Wiktionary
vb. (context idiomatic English) To remain untouched and unused for a long period of time.
Usage examples of "collect dust".
Invite spiders in, to weave great drooping cobwebs in the corners and collect dust?
Yet the 'persons within' have remained elusive, and it seems that the hundreds of volumes which collect dust and the annotations of psychoanalytic thinkers have not provided adequate answers to the persons they are written about.
The rifle and his shotgun were hanging on the wall where they could collect dust, and there were hunting prints hanging all over the place.
You know the smell you get when you turn on an old tube amplifier that's been unused long enough to collect dust?
It had just been thrown into boxes and left to collect dust, never to be read by anyone again.
She puts 'em in every June and lets 'em collect dust till September.