Anaconda snakes live in swamps and rivers. Anacondas also climb trees. Adults can get as big as 20 feet long. Anacondas are good swimmers. They have scales and can swim quickly. They kill by constricting their prey tightly so that it cannot breathe. Anacondas then drown their prey. Anacondas are found in South America.
In the passage above, what is the meaning of the word constricting?