The term 'on a diagonal' can be expressed in two ways: 'TILTED' (6 letters) and 'cattycornered' (13 letters). The term 'TILTED' implies that something is not in a straight line, but instead is at an angle. The term 'cattycornered' implies that something is positioned at an angle, usually in the corner of a room or space. Both terms refer to the same concept, which is that something is not in a straight line, but instead is on a diagonal.