noun, adjective, verb, -topped, -top⋅ping.| 1. | a bituminous substance, usually asphalt, for paving roads, parking lots, playgrounds, etc. |
| 2. | a road covered with blacktop. |
| 3. | pertaining to or surfaced with blacktop: a blacktop driveway. |
| 4. | to pave with blacktop. |