1
general::
1. Delay, retard, reduce speed, as in She slowed down the sled by dragging her foot, or Slow down, Bill; you're driving much too fast. [First half of 1800s] Also see SLOW UP. 2. Become less active or vigorous, as in Now that I'm in my seventies I find I've slowed down quite a bit. [Second half of 1800s]
American Heritage Idioms
2
general::
Phrase(s): slow down
to decrease speed; to go slower. • Please slow down. You are going too fast.
McGrawhill's American Idioms And Phrasal Verbs