What is the meaning of slowing?

noun

• A decrease in rate of change.
  • usage: "the deceleration of the arms race"
  • synonyms: deceleration, retardation

verb

• Lose velocity; move more slowly.
  • usage: "The car decelerated"
  • synonyms: decelerate, slow, slow down, slow up, retard
• Become slow or slower.
  • usage: "Production slowed"
  • synonyms: slow, slow down, slow up, slack, slacken
• Cause to proceed more slowly.
  • usage: "The illness slowed him down"
  • synonyms: slow, slow down, slow up