Bottom

This is sometimes used in England to suggest the posterior, the behind. So it might be word play for that; if about the bottom of a garden, hill or hole, it can suggest something at the back of your mind – known but pushed to the back; If you are at the bottom it suggest difficulties, or a long climb, effort to get to the top, or even back to where you were; being at the bottom can also be despair. The bottom of some sort of container depicts the holding power, the power to contain and support.