| Clue | Source | Date |
|---|---|---|
| Continue chugging along | USA Today | 16 Aug 2024 |
| ''Persist!'' | Newsday | 06 Jul 2021 |
| Don't stop plugging along | Universal | 27 Jul 2018 |
| Don't stop plugging along | ||
| Persist despite hardship | ||
| "Persevere!" | ||
| Continue plugging along | ||
| Last | ||
| Persist despite hardship |