/wawk"up'/ , n.
1. an apartment above the ground floor in a building that has no elevator.
2. a building, esp. an apartment house, that has no elevator.
adj.
3. located above the ground floor in a building that has no elevator.
4. having no elevator.
5. accessible to pedestrians from the outside of a building: a walk-up teller's window at a bank.
[ 1915-20, Amer.; n., adj. use of v. phrase walk up ]