drop-off

Noun

• a change downward
  • there was a decrease in his temperature as the fever subsided
    
  • there was a sharp drop-off in sales
    

• a steep high face of rock
  • he stood on a high cliff overlooking the town
    
  • a steep drop
    

• a noticeable deterioration in performance or quality
  • the team went into a slump
    
  • a gradual slack in output
    
  • a drop-off in attendance
    
  • a falloff in quality
    

Related words

• Synonyms: 
  decrease , lessening , cliff , drop , slump , slack , falloff , falling off