v.1. To decrease the speed or rate of something: The chef slowed down the mixer and added some flour to the batter. We slowed the boat down as we entered the harbor.
2. To move, work, or happen at a slower rate: We slowed down so that we could read the road sign.
3. To delay someone or something; retard someone or something: An injury slowed down the runner. A virus has slowed my computer down.