← BackshareGuessco worker/ˈkoʊ ˌwɜrkər/nounA person with whom one works in a job or profession; a colleague.The new co-worker introduced herself to the team on the first day.My co-worker helped me finish the project on time.She has a friendly relationship with all her co-workers.SynonymsassociatecolleaguecoworkerAntonymsboss