[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"
[v] reduce the speed of; "He slowed down the car"
[v] lose velocity; move more slowly; "The car decelerated"
[v] become slow or slower; "Production slowed"
[v] cause to proceed more slowly; "The illness slowed him down"