Definition of "bottom"
bottom
/ˈbɒtəm/
noun
countable and uncountable, plural bottoms
(BDSM) A submissive in sadomasochistic sexual activity.
verb
third-person singular simple present bottoms, present participle bottoming, simple past and past participle bottomed
(BDSM, intransitive) To be the submissive partner in a BDSM relationship.