Lean meaning : (of an object taller than its width and depth) An inclination away from the vertical. To incline, deviate, or bend, from a vertical position; to be in a position thus inclining or deviating. To incline in opinion or desire; to conform in conduct; often with to, toward, etc. Followed by against, on, or upon: to rest or rely, for support, comfort, etc. To hang outwards. To press against.