ponestajati

1. (to someone + gen.) to run out; to be running short
   Ponestaje nam vremena, moramo da požurimo. — We're running out of time, we have to hurry.
   Na kraju maratona počelo mi je da ponestaje snage. — At the end of the marathon I started running out of strength.
2. (of supplies) to dwindle; to run low
   Zalihe vode u gradu polako ponestaju. — The city's water supplies are slowly running low.

Usually impersonal: the person is in the dative and what runs out is in the genitive (ponestaje mi novca).