As a Noun:
1. The highest point, part or surface of something. English = top.
2. The highest point, part or surface of something, especially of a room or a container that is covered and viewed from the inside; the inside upper surface of a covered space or a container.
As a Verb or Adjective:
1. To be located at the highest point, part or surface of something. English = (be) at the top.
2. To be located just under the inside of the top surface of a covered space or a container.
3. To rise to the top of a covered space or a container, that is to just under the inside of the top surface.