cardiospasm: a spasm of the cardiac sphincter (between the esophagus and the stomach); if the cardiac sphincter does not relax during swallowing the passage of food into the stomach is obstructed
spasm: (pathology) sudden constriction of a hollow organ (as a blood vessel)
reef: one of several strips across a sail that can be taken in or rolled up to lessen the area of the sail that is exposed to the wind