slow up

Verb

• lose velocity; move more slowly
  • The car decelerated
    

• cause to proceed more slowly
  • The illness slowed him down
    

• become slow or slower
  • Production slowed
    

Related words

• Synonyms: 
  decelerate , slow , slow down , retard , slack , slacken
• Antonyms: 
  accelerate , speed up , speed , quicken