partizan

1. (world war ii) Partisan
   Moj deda je bio partizan u Drugom svetskom ratu. — My grandfather was a Partisan in World War II.
   Partizani su oslobodili Beograd 1944. godine. — The Partisans liberated Belgrade in 1944.
2. (irregular forces) guerrilla; partisan
   Partizani su se krili u šumi i napadali noću. — The guerrillas hid in the forest and attacked at night.
3. dated formal (supporter of idea, party) partisan; follower
   U starim novinama pisali su o njemu kao o partizanu republikanske ideje. — Old newspapers wrote about him as a partisan of the republican idea.

Capitalized, Partizan is the Belgrade sports club. In the sense "supporter" the word is dated: modern Serbian uses pristalica, pobornik, privrženik.