| Answer | Crossword Clue |
|---|---|
| DREDGE | Deepen a waterway |
| dredged | deepen (as a waterway) with a dredging machine |
| DREDGE | Deepen a channel |
| DREDGE | Deepen, as a canal |
| DREDGE | Deepen, as a channel |
| flashboard | one of a set of boards set up at the sides of a water channel to deepen it |
| flashboards | FLASHBOARD, one of a set of boards set up at the sides of a water channel to deepen it |
