LOWEST PART [C] › the lowest part of something: [usually singular] Click on the icon at the bottom of the page. FLAT SURFACE [C] › the flat surface on the lowest side of something: [usually singular] There was a price tag on the bottom of the box. LOWEST POSITION [no plural] › the lowest position in a group, organization, etc: He got bad exam marks and is at the bottom of the class. SEA/RIVER ETC [no plural] › the ground under a river, lake, or sea: Divers found the wreck on the bottom of the ocean. FURTHEST PART [no plural] › the part of a road or area of land that is furthest from where you are: Go to the bottom of the road and turn left. PART OF THE BODY [C] › the part of your body that you sit on be at the bottom of sth › to be the cause of a problem or situation