zatajiti

1. (of a machine, organ) to fail; to give out
   Kočnice su zatajile na nizbrdici. — The brakes failed on the downhill.
   Srce mu je zatajilo tokom operacije. — His heart gave out during the operation.
2. (of a person, team) to fall short; to let down
   Napadač je zatajio u odlučujućoj utakmici. — The striker let the team down in the deciding match.
3. to conceal; to hide; to hush up
   Zatajio je deo prihoda od poreske uprave. — He concealed part of his income from the tax office.
   Nije mogla da zataji koliko je srećna. — She couldn't hide how happy she was.

In the sense 'fail' it is intransitive: motor je zatajio.