prikriti

1. (of facts, mistakes, crime) to conceal; to cover up
   Pokušao je da prikrije svoju grešku od šefa. — He tried to hide his mistake from the boss.
   Policija sumnja da su hteli da prikriju zločin. — The police suspect they wanted to cover up the crime.
2. (of feelings) to hide; to mask
   Nije mogla da prikrije razočaranje. — She couldn't hide her disappointment.
3. (of an object, mark) to cover; to conceal; to mask
   Šminkom je prikrila ožiljak na obrazu. — She concealed the scar on her cheek with make-up.

The imperfective is prikrivati; often used with pokušati da (to try to conceal).