prep 在……下面(below the surface or level of，esp directly or vertically beneath;hidden， disguised as by a false appearance)：～the bed/the light/the carpet/the floor/the sand/the table/the sideboard/the balcony在床/灯/地毯/地板/沙子/桌子/餐具柜/阳台的下面;Caving means exploring the passages～the hills. 挖洞意味着在山下面挖掘通道。He curled himself up～the blankets. 他在毯子里蜷作一团。U～his apparent politeness there is deceit and cunning. 他表面看上去很客气，实际上既奸诈又狡猾。U～all of his pretense， he's a gracious fellow. 他显得矫饰做作，其实却是一个通情达理的人。〖同〗 under，below;〖反〗over， on;

adv在下面(底下)(below，in a place beneath; on the lower surface or underside)：wear a fur coat with nothing～(某人)除了皮上衣，里面什么也没穿;There is a pile of magazines in the corner—have you looked～?角落里有一摞杂志，你查看过底下吗?(insect) creep further～(虫子)越钻越深;He seems ambitious， but he's a nice/modest man～. (fig) 他看起来野心勃勃，可实际上他是个相当不错/谦虚的人。〖同〗below，under，beneath;〖反〗above;

n下面(部)(part or side below or under)[U， the～]：the～of a car/a shelf/a sofa汽车/书架/沙发的底部;Have you ever seen the～of a bus? 你见过汽车的底面吗?There is a crack on the～of the basin. 盆底上有个裂纹。〖同〗bottom;〖反〗above;

【辨异】underneath与below、under和beneath的区别见BELOW。