adv (1) 沿樓梯往下(down the stairs)：The old man fall～and broke his arm. 老人從樓梯上跌下，摔折了手臂?！挤础絬pstairs;
(2) 在(往)樓下(on or to a lower floor (esp the main or ground floor))：go/come～下樓去/來;run～跑下樓;wait/live～在樓下等/住;leave sth ～把某物留在樓下;the neighbours/people～樓下的鄰居/人們;Are you～? 你在樓下嗎?〖反〗upstairs;
adj 樓下的(that which is on a lower floor (esp the main or ground floor))[作attrib]：the～rooms/bedrooms/phone/flats 樓下的房間/臥室/電話/單元;the～part of the house房子的底樓部分;〖反〗upstairs;
n 樓下(lower floor of a building， esp the main or ground floor)[C](接sing動詞)：The～isn't so bad. 樓下不那么差。They rent the whole～. 他們租了整個底樓?！挤础絬pstairs