1) Braked 2) Decelerated 3) Heeded a flagman 4) Lost speed 5) Lost velocity 6) Obeyed a flasher 7) On delay 8) Reduced speed 9) Restrained 10) Tapped the brakes 11) Went from 50 to 40 12) Went from 60 to 40 Found on https://www.crosswordclues.com/clue/slowed
1) Braked 2) Decelerated 3) Heeded a flagman 4) Lost speed 5) Lost velocity 6) Obeyed a flasher 7) On delay 8) Reduced speed 9) Restrained 10) Tapped the brakes 11) Went from 50 to 40 12) Went from 60 to 40 
• (imp. & p. p.) of Slow