sadomasochism in British English
(ˌseɪdəʊˈmæsəˌkɪzəm, ˌsædəʊ-)
noun1. the combination of sadistic and masochistic elements in one person, characterized by both aggressive and submissive periods in relationships with others
2. sexual practice in which one partner adopts a sadistic role and the other a masochistic one
Abbreviation: SM, S & M. Compare sadism, masochism