A blockage of blood is a medical condition in which the flow of blood is obstructed. The crossword solutions for this term are CLOT (4 letters), LOGJAM (6 letters), and SNAKE (5 letters). A CLOT is a mass of coagulated blood that can form in the veins or arteries, blocking the flow of blood. A LOGJAM is a situation in which a large number of objects become stuck together, preventing movement. Finally, a SNAKE is an object that is used to unblock a pipe or tube by pushing the obstruction out of the way.