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Dictionaryindoors
adverb

indoors

Inside a building.

We stay indoors and play cards when it rains.

Etymology
inEnglishwithin
+doorsEnglishentrance to a building

The expression treats the doors as the boundary of a building. Being indoors places someone on the enclosed side of that boundary.

More examples

  • Please bring the plants indoors before the first frost.
  • Smoking is not allowed indoors.
  • She works indoors, away from the summer heat.

Forms

indoor adjective — Located or taking place inside buildings.

Similar words

inside
Also refers to enclosed spaces other than buildings.