potpisivati

1. (a document, contract) to sign
   Direktor svako jutro potpisuje gomilu papira. — The director signs a pile of papers every morning.
   Ne potpisujte ništa dok ne pročitate ugovor. — Don't sign anything until you've read the contract.
2. (potpisivati se) to sign one's name
   Ovde se potpisujete, ispod datuma. — You sign here, under the date.
3. (of a film, book, song) to be the author of; to be credited with
   Scenario za film potpisuje poznati pisac. — The film's script is by a well-known writer.

The perfective is potpisati.