outside a store; outside a shop
Refers to the area outside a shop or store, often used in contrast with 店内 (inside the store).
店外にも行列ができている。
There is a line forming outside the store as well.
店外の看板を見て入るかどうか
I decided whether to go in after seeing the sign outside the shop.
店内 refers to the inside of a store while 店外 refers to outside or off the premises.
Compound of 店 (store) and 外 (outside).