B1
into or inside a building
Dictionary examples:
The pizza delivery guy flew indoors on his jetpack. Technology is amazing! (0.0)
The elephant tried to come indoors for tea, but got stuck in the doorway. (0.0)
My dad brought his barbecue indoors. Now our house smells like a steakhouse! (0.0)
Come indoors, it's cold outside. (19.7)
Spring bulbs can be grown indoors. (29.8)