| Grasp |
| Six-footer |
| Comprehend |
| Depth unit |
| Understand? |
| Six feet under |
| Six feet down? |
| About 1.8 meters |
| Nautical measure |
| Six feet of water |
| It equals six feet |
| Ocean-depth measure |
| Nautical depth unit |
| Nautical measurement |
| Get to the bottom of |
| Understand thoroughly |
| 1967 Raquel Welch romp |
| Nautical unit of measure |
| Sailor's measure of depth |
| Comprehend — a depth of six feet |
| Come to understand — unit of depth |