štimati

1. colloq. (usually negated) to be right; to be in order
   Nešto ovde ne štima. — Something's not right here.
   Kod njih u braku odavno ne štima. — Things haven't been right in their marriage for a long time.
2. colloq. (of figures, facts) to add up; to be correct
   Račun ne štima, naplatili su nam dva piva više. — The bill doesn't add up, they charged us for two extra beers.
   Njegova priča ne štima. — His story doesn't add up.
3. colloq. (+ acc.) to tune; to adjust
   Gitarista još štima gitaru pre koncerta. — The guitarist is still tuning his guitar before the concert.

In the sense "to be right" it is mostly heard in nešto ne štima "something is off".