Reduce
Part of speech: verb
Definition: To bring down the size, quantity, value or intensity of something; to diminish, to lower, to impair. To lose weight. To bring to an inferior rank; to degrade, to demote. To humble; to conquer; to subdue; to capture. To bring to an inferior state or condition. To decrease the liquid content of food by boiling much of its water off. To add electrons / hydrogen or to remove oxygen. To produce metal from ore by removing nonmetallic elements in a smelter. To simplify an equation or formula without changing its value. To convert to written form (Usage note: this verb almost always take the phrase "to writing").
Example sentence: The medical literature tells us that the most effective ways to reduce the risk of heart disease, cancer, stroke, diabetes, Alzheimer's, and many more problems are through healthy diet and exercise. Our bodies have evolved to move, yet we now use the energy in oil instead of muscles to do our work.
Tighten
Part of speech: verb
Definition: To make tighter.To become tighter.To make money harder to borrow or obtain.To raise short-term interest rates.
Example sentence: Actually, I believe in everything, including astrology and tarot cards. All of it is just another way for people to try and tighten the link to the spirits in our universe. I believe it exists for all people.