smeniti

1. (from a post) to dismiss; to remove from office; to sack
   Vlada je smenila direktora posle skandala. — The government removed the director after the scandal.
   Trenera su smenili posle tri poraza zaredom. — The coach was sacked after three defeats in a row.
2. (on a shift, post) to relieve; to take over from; to replace
   Koleginica će me smeniti u osam uveče. — My colleague will relieve me at eight in the evening.
3. (smeniti se) to alternate; to follow one another
   Na toj poziciji su se smenila tri ministra za godinu dana. — Three ministers came and went in that post within a year.

In the 'dismiss' sense it often takes sa + genitive: smeniti sa funkcije.