noun, verb, -cast, -cast⋅ing.| 1. | Also called spatter dash. an exterior wall finish composed of mortar and fine pebbles mixed together and dashed against the wall. Compare pebble dash. |
| 2. | a crudely formed pattern or model. |
| 3. | to cover or coat with roughcast. |
| 4. | to make, shape, or prepare in a rough form: to roughcast a story. |