žandar

1. (in card games) jack; knave
   Imam žandara i dva keca. — I've got a jack and two aces.
   Bacio je žandara herc na sto. — He threw the jack of hearts on the table.
2. gendarme
   Njegov deda je bio žandar u Kraljevini Jugoslaviji. — His grandfather was a gendarme in the Kingdom of Yugoslavia.
3. (of a country or person) policeman; enforcer
   Ta zemlja se ponaša kao žandar sveta. — That country acts like the world's policeman.

In Serbia the word is often heard as the name of the jack in cards. A member of today's Serbian gendarmerie is called žandarm, or colloquially žandar; žandar is also used in historical contexts.