žalba

1. complaint
   Podneo sam žalbu na lošu uslugu u hotelu. — I filed a complaint about the poor service at the hotel.
   Kupci su imali mnogo žalbi na novi model. — Customers had a lot of complaints about the new model.
2. (in law) appeal
   Advokat je uložio žalbu na presudu. — The lawyer lodged an appeal against the verdict.

Usually used with na + acc.: žalba na odluku; the verbs are podneti or uložiti žalbu.