downstairs
adj. placeadj. on a lower floor of a building, especially the ground floor of a house. You use this when you are moving to or staying on the level below where you are now.
adj. situated on or relating to a lower floor of a building. Often functions as a locative complement or a modifier of movement.
I am going downstairs to get a glass of water.
The kitchen and living room are downstairs, while the bedrooms are on the upper floor.
After hearing a suspicious thud in the middle of the night, he cautiously crept downstairs to investigate the source of the noise.
From down- + stair + -s.
Typically follows the verb of motion or the verb 'to be'.
I am going to downstairsI am going downstairsDownstairs is a locative adverb and does not require the preposition 'to' when used with verbs of motion.