offshore [ˈɒfʃɔ:ɼ] adjective 1. [oil terminal, oilrig] offshore inv 2. [fishing, shipping] costiero ( f costiera) [island] vicino ( f vicina) alla costa offshore [ˈɒfʃɔ:ɼ] adverb 1. [out at sea] al largo 2. [near coast] vicino alla costa