1. A thin layer of lean concrete or of fine gravel or sand applied to a surface to fill voids and to provide a smoother, cleaner, drier, or more durable finish; esp. fine gravel or sand over freshly placed asphaltic concrete.
2. Sprinkling small stone chips over a freshly tarred road.
3. Placing a material over piping to completely cover it.
4. Compacting of soil directly over a drain tile, thereby reducing its tendency to move into the tile.