Quadral 31: Reverse, Reverse! Very Hard

One word:

  1. Appears in an Intro to Chemistry textbook.
  2. Relevant to negotiation.
  3. Heard while buying gardening supplies.
  4. (Twist) Can reverse itself, or be reversed.

AI will judge if your word fits—and if it's better than the AI's answer.

Need a hint?

For the AI Answer, think red wine.