Run up and Walk-up

Run up verb - Pile up (debts or scores).

Walk-up and run up are semantically related. in short preliminary event topic. In some cases you can use "Walk-up" instead a noun "Run up".

Walk-up noun - An apartment building without an elevator.

Run up and walk-up are semantically related. Sometimes you can replace term "Run up" with "Walk-up", this terms are similar.