Proton pumps are a type of protein found in cells that help regulate the acidity of the cell's environment. Antonyms for proton pumps would be substances or actions that decrease or neutralize acidity, such as antacids, alkaline substances, or buffering agents. Antacids, such as Tums or Rolaids, work by neutralizing the excess acid in the stomach, providing relief from heartburn or indigestion. Alkaline substances, such as baking soda or lemon juice, can also help neutralize acid in the body. Buffering agents, such as sodium bicarbonate, can also help regulate the acidity of the body, helping to prevent acidosis, a condition where the body's pH becomes too acidic.