1. To go to or be located at the lowest part of something, as far away from the top as is possible. English = (be) on the bottom of something.
2. To go to or be located at the bottom of a body of water (river, lake, or sea); or to go to or be located on the area at the bottom of a container. English = sink to the floor, sink to the bottom.
3. To be located in the least powerful or important level in an organisation, the lowest point on a scale, or to be the worst student in a class. English = (be) on the bottom of, (be) bottom of.