falling off

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a noticeable deterioration in performance or quality (Freq. 1)
- the team went into a slump
- a gradual slack in output
- a drop-off in attendance
- a falloff in quality
• Syn:
slump, slack, drop-off, falloff
• Derivationally related forms:
fall off (for: falloff), drop off (for: drop-off), slack (for: slack), slump (for: slump)
• Hypernyms:
deterioration, decline in quality, declension, worsening