WEBthe bottom or lower end of a space or object: They built a house at the foot of a cliff. 他们在悬崖脚下建了一所房子。. bed uk / bed/ us / bed/ C2 noun. the bottom of something, or something that serves as a base: Many strange plants and fish live on the sea bed. 海底生活着许多奇异的植物和鱼类。.