形容詞 downstairs:

1. on or of lower floors of a building
   同義詞：downstair

副詞 downstairs:

1. on a floor below
   同義詞：down the stairs, on a lower floor, below

1. She slipped and went hurtling downstairs.
   她一失足咕嚕嚕跌下樓梯。
2. He returned downstairs in disgust.
   他厭惡地轉(zhuǎn)身下樓。
3. We haven't painted the downstairs yet.
   我們還沒有給樓下刷漆。
4. Is anyone downstairs?
   有人在樓下嗎？
5. She was ill and stayed in the downstairs bedroom for a whole day.
   她病了，在樓下的臥室里呆了一整天。

down.stairs

adv.（副詞）
Down the stairs:
順樓梯而下：
例句：
raced my friend downstairs.
往樓下追我朋友

To or on a lower floor:
向樓下或在樓下：
例句：
went downstairs to answer the front door.
下樓去開前門

adj.also （形容詞） 也作
downstair
Located on a lower or main floor.
在低層樓或底樓的
n.（名詞）

The lower or main floor.
低層樓或底樓