indoors
From Longman Dictionary of Contemporary Englishindoorsin‧doors /ˌɪnˈdɔːz◂ $ -ɔːrz◂/ ●●○ adverb IN/INSIDEinto or inside a building OPP outdoors Let’s go indoors and have something to eat. It rained all day so we had to stay indoors.Examples from the Corpusindoors• It was too sunny to think of staying indoors.• Some arts and crafts projects are too messy to be done indoors.• Let's stay indoors where it's nice and warm.