run-up
1. [ noun ] a substantial increase over a relatively short period of time
Synonyms: runup
Examples:

"a runup in interest rates" "market runups are followed by corrections"

Related terms: increase
2. [ noun ] the approach run during which an athlete gathers speed
Related terms: approach long_jump broad_jump pole_vault bowling
Similar spelling:   runup
  run_up
  rump
  Rumph