| Clue | Source | Date |
|---|---|---|
| Observe on the sly | Newsday | 11 Jul 2023 |
| Eye slyly | Eugene Sheffer | 08 Mar 2021 |
| Check out secretly | The Washington Post Sunday | 27 Dec 2020 |
| Check out on the sly | Newsday | 14 Jun 2020 |
| View through a knothole | Universal | 01 Aug 2019 |
| View through a knothole | ||
| Eye on the sly | The Washington Post | 31 Jul 2016 |
| Spy on | LA Times Daily | 24 Aug 2015 |
| Spy on | ||
| Check out on the sly | ||
| Eye slyly | ||
| Eye slyly | ||
| Spy on | ||
| Check out on the sly | ||
| View surreptitiously | ||
| Take a quick look. | ||
| View surreptitiously |