heighten (v.)
- accelerate
- aggrandize
- aggravate
- amplify
- annoy
- augment
- better
- boost
- build
- complicate
- compound
- concentrate
- condense
- consolidate
- deepen
- deteriorate
- double
- elevate
- embitter
- enhance
- enlarge
- erect
- escalate
- exacerbate
- exaggerate
- exasperate
- expand
- extend
- heave
- heft
- heist
- hike
- hoist
- improve
- increase
- intensify
- irritate
- levitate
- lift
- lob
- loft
- magnify
- mount
- multiply
- provoke
- raise
- ramify
- rear
- redouble
- reinforce
- rise
- rouse
- sharpen
- sky
- sour
- strengthen
- supplement
- triple
- up
- upheave
- uphold
- uplift
- upraise
- wax
- whet
- worsen