heat up (v.)
- accelerate
- aggravate
- agitate
- alienate
- amplify
- annoy
- antagonize
- arouse
- augment
- complicate
- concentrate
- condense
- consolidate
- deepen
- deteriorate
- double
- embitter
- enhance
- enlarge
- envenom
- estrange
- exacerbate
- exaggerate
- exasperate
- excite
- fan
- ferment
- fire
- foment
- heat
- heighten
- incense
- incite
- increase
- inflame
- infuriate
- instigate
- intensify
- irritate
- madden
- magnify
- nettle
- pique
- provoke
- rally
- ramify
- redouble
- reinforce
- sharpen
- sour
- strengthen
- tickle
- triple
- whet
- worsen
