adv (1) 沿楼梯往下(down the stairs)：The old man fall～and broke his arm. 老人从楼梯上跌下，摔折了手臂。〖反〗upstairs;

(2) 在(往)楼下(on or to a lower floor (esp the main or ground floor))：go/come～下楼去/来;run～跑下楼;wait/live～在楼下等/住;leave sth ～把某物留在楼下;the neighbours/people～楼下的邻居/人们;Are you～? 你在楼下吗?〖反〗upstairs;

adj 楼下的(that which is on a lower floor (esp the main or ground floor))[作attrib]：the～rooms/bedrooms/phone/flats 楼下的房间/卧室/电话/单元;the～part of the house房子的底楼部分;〖反〗upstairs;

n 楼下(lower floor of a building， esp the main or ground floor)[C](接sing动词)：The～isn't so bad. 楼下不那么差。They rent the whole～. 他们租了整个底楼。〖反〗upstairs