suprotstavljati

1. (suprotstavljati se + dat.) to oppose; to resist; to stand up to
   Opozicija se suprotstavlja novom zakonu. — The opposition is opposing the new law.
   Uvek se suprotstavlja šefu na sastancima. — He always stands up to the boss in meetings.
2. (something to something) to contrast; to set against
   U romanu autor suprotstavlja selo i grad. — In the novel, the author contrasts the village with the city.

Most often used with se and the dative: suprotstavljati se kome/čemu.