1. (noun) a noticeable deterioration in performance or quality

• drop-off
• falling off
• slack
• slump

1. (noun) a noticeable deterioration in performance or quality

• declension
• decline in quality
• deterioration
• worsening

1. (noun) a noticeable deterioration in performance or quality

• abate
• slack
• slake
• drop away
• drop off
• fall away
• slip
• fall away
• fall off
• fall off
• fall off
• sink
• sink
• slump
• slump
• relax
• slack
• slack up
• slacken
• slack
• slacken
• slow
• slow down
• slow up