| Clue | Source | Date |
|---|---|---|
| Soften | USA Today Quick | 21 Jul 2025 |
| ___ dub (rhyming heart sounds) | ||
| Half a heartbeat sound | ||
| ____scope | USA Today Quick | 13 Jan 2025 |
| ___ dub (heart sounds) | ||
| ___ dub (heart sounds) | ||
| Wheel shaft | USA Today Quick | 20 Jun 2024 |
| ___ dub (heart sounds) | ||
| Friction reducer: Abbr | Wall Street Journal | 16 Oct 2018 |
| ___ dub (heart sounds) | ||
| Friction reducer: Abbr. | ||
| Oil or grease: Abbr. | ||
| Friction reducer: Abbr. | ||
| Oil or grease: Abbr. | ||
| Oil, for one: Abbr. | ||
| Oil: Abbr. |