Adjective. 1: something not locked or closed. 2: to be honest and not deceptive. 3: something accessible. 4: someone willing to listen. 5: unrestricted. Verb. 1:To release something that was once locked. Example: after a really bad previous relationship, Tony somehow managed to open her heart to love again. 2: To start something. Example: Tonys band was there to open the show.