run-up

名词 run-up:

1. a substantial increase over a relatively short period of time
   同义词：runup
2. the approach run during which an athlete gathers speed

动词 run-up:

1. pile up (debts or scores)
   同义词：run up
2. raise
   同义词：hoist, run up
3. fasten by sewing; do needlework
   同义词：sew, run up, sew together, stitch
4. accumulate as a debt
   同义词：chalk up, run up
5. make by sewing together quickly
   同义词：run up

1. Pole vaulters need long run-ups.
   撑竿跳需要长距离助跑。