What does the abbreviation CHF mean?

CHF. Congestive heart failure. As a simple explanation one can say this is a condition in which the heart has difficulty providing blood flow to the tissues and organs of the body. The heart muscle is usually weak, too stiff, or both.
See below. CHF = congestive heart failure = a condition where the heart muscle is weak and fluid backs up and leaks into the air spaces in the lungs causing shortness of breath.