| Clue | Source | Date |
|---|---|---|
| Make even smoother | The Washington Post | 04 Jan 2019 |
| Make even smoother | LA Times Daily | 04 Jan 2019 |
| Make even smoother | ||
| Smooth over | New York Times | 14 Feb 2016 |
| Smooth over | ||
| Make even smoother | ||
| Make even smoother | ||
| Smooth over | ||
| Smooth over | ||
| Work over with grit | ||
| Make even smoother | ||
| Treat icy roads again | ||
| Finish anew |