1. reverting a failure to maintain a higher state
  2. rough sledding a difficulty that can be overcome with effort
  3. revolting highly offensive; arousing aversion or disgust
  4. reverberating characterized by resonance
  5. vacillating uncertain in purpose or action
  6. revival meeting an evangelistic meeting intended to reawaken interest in religion
  7. fee splitting payment of part of the fee in return for the referral
  8. devastating wreaking or capable of wreaking complete destruction
  9. revelation the act of making something evident
  10. central heating a heating system in which air or water is heated at a central furnace and sent through the building via vents or pipes and radiators
  11. regulating the act of controlling or directing according to rule
  12. revising editing that involves writing something again
  13. excruciating extremely painful
  14. office building a building containing offices where work is done
  15. isolating relating to or being a language in which each word typically expresses a distinct idea and part of speech and syntactical relations are determined almost exclusively by word order and particles
  16. rollerblading skating using Rollerblades
  17. assimilating capable of taking (gas, light, or liquids) into a solution
  18. oscillating having periodic vibrations
  19. fascinating capable of arousing and holding the attention
  20. service routine a routine that can be used as needed