• 1. place (something) where one cannot find it again [lose, mislay, misplace]
• 2. miss from one's possessions; lose sight of [lose]
• 3. fail to keep or to maintain; cease to have, either physically or in an abstract sense [lose]
• 4. fail to win [lose]
• 5. get lost, as without warning or explanation [disappear, vanish, go away]
• 6. become invisible or unnoticeable [vanish, disappear, go away]
• 7. get confused

Finished version: изгубити

Verbal noun: губљење

The meanings 'disappear' and 'get confused' require the reflexive particle се.