1. To make or set open; to render free of access; to unclose; to unbar; to unlock; to remove any fastening or covering from; as, to open a door; to open a box; to open a room; to open a letter. 'And all the windows of my heart I open to the day.' (Whittier) ... 2. To spread; to expand; as, to open the hand. ... 3. To disclose; to reveal; to interpr...