drop behind

Từ điển WordNet v3.1 - WordNet Dictionary

verb

to lag or linger behind (Freq. 1)
- But in so many other areas we still are dragging
• Syn:
drag, trail, get behind, hang back, drop back
• Derivationally related forms:
trailer (for: trail)
• Hypernyms:
lag, dawdle, fall back, fall behind
• Verb Frames:
- Something ----s
- Somebody ----s
- Something is ----ing PP
- Somebody ----s PP