The conscious disruption of production in a workplace by the employees. What workers do when they can't take it anymore. It can be both an organized effort to change the conditions at work and an individual act to vent frustrations.
Sabotage is a form of organized inefficiency by workers, designed to negatively impact the employer. But the one thing sabotage isn't, is destruction of the machinery of production, or the product itself. The machinery of production and the product of workers' labor belongs to the workers themselves, and destruction of the same would be like burning one's own house down!