Related Clues:
- Strengthens
- Dredges
- Intensifies
- Becomes more profound
- Excavates further
- Falls more
- Digs down further
- Gets more interesting, say
- Gets more profound
- Increases in intensity, as a storm
- Make further down, say ditch
- Increases in intensity
- Extends farther down
- Gets more complicated
- On the way up, rate of travel increases around north-east