The remains of something that has been destroyed or broken up; SYN. dust, junk, rubble, detritus.
1. The remains of something broken down or destroyed
2. An accumulation of fragments of rock
3. Something discarded; rubbish

ETYM From an assumed Old French dim. of robe See Rubbish.
1. A mass of rough stones or fragments of concrete, usually resulting from a demolition.
2. Rough stone as it comes from the quarry.
3. Water-worn or rough broken stones; broken bricks, etc., used in coarse masonry, or to fill up between the facing courses of walls.