exacerbate (v.)
- accelerate
- acerbate
- aggravate
- alienate
- amplify
- annoy
- antagonize
- augment
- bitter
- chafe
- complicate
- concentrate
- condense
- consolidate
- damage
- deepen
- deteriorate
- dilapidate
- double
- embitter
- enhance
- enlarge
- envenom
- estrange
- exaggerate
- exasperate
- fret
- gall
- grate
- gravel
- grit
- harm
- heighten
- hurt
- impair
- increase
- inflame
- infuriate
- injure
- intensify
- irritate
- madden
- magnify
- provoke
- ramify
- rasp
- redouble
- reinforce
- sharpen
- sour
- strengthen
- triple
- weaken
- whet
- worsen