Related Clues:
- Kick up
- Compound
- Make stronger
- Refines, in a way
- Thicken, as a mystery
- Extend farther down
- Drill further
- Get more complicated
- Make more navigable, as a channel
- Tease Cal badly and mount up
- Increase in depth
- Cause to increase, say dispute (8).
- Increase in intensity or extent
- Raise to higher level, perhaps war
- Increase in intensity or extent, like trouble brewing