#1 slow down v. lose velocity; move more slowly; "The car decelerated". wn #2 slow down v. become slow or slower; "Production slowed". wn #3 slow down v. cause to proceed more slowly; "The illness slowed him down". wn #4 slow down v. reduce the speed of; "He slowed down the car". wn #5 slow down v. become less tense, rest, or take one's ease; "He relaxed in the hot tub"; "Let's all relax after a hard day's work". wn