-  ohíšnica private plot for use of member of a cooperative; VB croft 
-  ojágnjiti se to give birth to a lamb; to lamb, to drop lamb; to yean 
-  okáč a large-eyed person 
-  oklátiti to beat down; to shake down; (sadje) to knock down with a pole 
-  okléjiti to paste (on); to smear with a sticky substance 
-  okópati to bathe, to give someone a bath
 
 okópati se to have (ali to take) a bath, (v naravi) to bathe
 
-  okrák (žabji krak) hind leg of a frog; (žabja jajca) frogspawn 
-  okrtáčiti (čevlje, klobuk, obleko) to brush; (koga) to give someone a dressing-down 
-  okupátor occupier; enemy who occupies a country 
-  olíkanec a well-mannered person 
-  omalovaževáti to belittle, to slight, to disregard, to disdain, to depreciate, to hold in disdain; to think little or nothing of; to set at naught; to despise, to scorn; to run down; to cast a slight (kaj upon something) 
-  omedlél fainted; in a swoon; in a dead faint; in a fainting fit 
-  omedléti to swoon; to faint away, to have a fainting fit; to lose consciousness; to pass out, to black out, to have a blackout 
-  onesvéstiti se to faint away; to have a fainting fit; to swoon, to fall lifeless; to lose consciousness; to pass out; to black out, to have a blackout 
-  onesvéščen fainted, in a fainting fit; in a swoon
 
 popolnoma onesvéščen in a dead swoon
 
-  operatêr medicina operating surgeon; someone who operates a machine, operator
 
 filmski operatêr projectionist
 
-  opíliti to file (away, down); to file a thing smooth 
-  opláziti to graze; to skim; to touch slightly; (udariti) to beat, to strike; to administer a drubbing 
-  oplotíti to fence in; to enclose with a fence 
-  oponášati to imitate, to copy; to mimic; to counterfeit; to play the ape, to ape; (za vzgled si koga vzeti) to take a leaf out of (ali from) someone's book