Bottom/ˈbɑːtəm/ Definition 1 of 5Pro Tip 1/2Physical Extremes Use 'bottom' when talking about the extreme lowest part of an object or place. We found the treasure at the bottom of the ocean. Pro Tip 2/2Symbolic Lows 'Bottom' can indicate the lowest point in a situation or condition. After losing his job, he felt he had hit rock bottom.