Bottom is the lowest part or underside of something. The bottom of a swimming pool is where your feet touch when you dive deep. The bottom of a page is where you find the page number. When you clean your room, you might discover a lost toy at the bottom of your closet, buried under everything else.

In everyday conversation, people use bottom in many ways. Athletes who finish in last place end up at the bottom of the standings. Students sometimes worry about being at the bottom of the class in a subject, though hard work can change that. When you get to the bottom of a mystery, you've uncovered the truth hiding underneath all the confusing clues.

The word can also mean your rear end or buttocks, the part you sit on. Parents might tell young children to sit on their bottoms during storytime.

Related words help show what bottom means: the top is the opposite, the base is similar but usually refers to the foundation something rests on, and underneath describes the position below something. Whether you're talking about the bottom of the ocean, the bottom of the ninth inning, or the bottom bunk bed, you're always referring to the lowest position or final point of something.