0 the lowest part of something: --
The rich usually get richer, while the people at the bottom (= at the lowest position in society) stay there.
The manager of the hotel started at the bottom (= in one of the least important jobs) 30 years ago, as a porter.
At school, Einstein was (at the) bottom of (= the least successful student in) his class.
Extra information will be found at the bottom of the page.
4 the buttocks --
Stand up straight, tuck your tummy in and tuck your bottom under.
She was wearing a tiny skirt that only just covered her bottom.
We took all the rubbish to the bottom of the garden and burned it.
The water in the lake is so clear that you can see the bottom.