1. noun or verb. To construct or fabricate, or the act thereof. 2. Lighting. To brighten in intensity, excitement or anticipation, nearing a climactic moment. "Stand-by Spots to build full-body at the end." 3. Lighting. A modifier that can be applied to a step effect whereby each additional step is added rather than going out. Once all steps are added, all go out and then the sequence repeats.