| Clue | Source | Date |
|---|---|---|
| Knock on | LA Times Daily | 17 Feb 2024 |
| Knock on | Universal | 07 Aug 2023 |
| Knock on | New York Times | 22 Apr 2023 |
| Knock on | LA Times Daily | 15 Jun 2022 |
| Knock on | Universal | 06 Jun 2022 |
| Knuckle on | Newsday | 30 Apr 2022 |
| Knock on, as a door | Wall Street Journal | 24 Aug 2021 |
| Knock on, as a window | New York Times | 22 Nov 2020 |
| Knock on, as a door | New York Times | 22 May 2019 |
| Knock on, as a door | ||
| Knock on | LA Times Daily | 28 Dec 2016 |
| Knock on | ||
| Knock on, as the door | ||
| Knock one's knuckles against | ||
| Knock on | ||
| Knock one's knuckles against | ||
| Knock on, as a door | ||
| Knock on | ||
| Knock on, like Poe's raven | ||
| Knock on, as a door |