noun
outdoor stairs; external stairway
Refers to stairs located outside a building, often used for fire escapes or access to upper floors from the exterior.
このアパートの外階段は雨の日は滑りやすい。
The outdoor stairs of this apartment building are slippery on rainy days.
火事のときは外階段を使っ
In case of fire, please evacuate using the external stairway.