1.  run-up(n = noun.event) runup - a substantial increase over a relatively short period of time; "a runup in interest rates"; "market runups are followed by corrections"
is a kind of increase

2.  run-up(n = noun.act) - the approach run during which an athlete gathers speed;
is a kind of approach, approaching, coming
is a part of bowling, broad jump, long jump, pole jump, pole jumping, pole vault, pole vaulting