olabaviti

1. to loosen; to slacken
   Olabavio je kravatu i seo na kauč. — He loosened his tie and sat down on the couch.
   Šraf se olabavio, treba ga pritegnuti. — The screw has come loose; it needs tightening.
2. (of rules, control) to relax; to ease
   Vlada je olabavila mere protiv epidemije. — The government relaxed the measures against the epidemic.

With se it means to come loose (šraf se olabavio).