| Clue | Source | Date |
|---|---|---|
| Ingrained pattern of behavior | USA Today | 17 Aug 2024 |
| Practice that's hard to break | Universal | 30 Jul 2023 |
| It may be hard to break | Eugene Sheffer | 11 Jul 2022 |
| It's difficult to stop this performance in vintage costume from The Abbey | Irish Times Crosaire | 04 Mar 2021 |
| Something hard to kick | Wall Street Journal | 27 Feb 2021 |
| It may be hard to break | Wall Street Journal | 29 Apr 2019 |
| It may be hard to break | ||
| It may die hard, they say | Wall Street Journal | 17 Nov 2018 |
| It may die hard, they say | ||
| It might die hard |