means the deliberate destruction, obstruction, or undermining of something — equipment, plans, or efforts — usually done covertly to disrupt an enemy, employer, or rival.

from From French sabotage, from saboter, 'to clatter along in clogs' and hence 'to do clumsily, to botch' — built on sabot, a wooden shoe. The vivid popular tale claims French workers hurled their sabots into machinery to jam it, but that image is mostly folklore; the real path runs through the idea of working badly or noisily, like someone stomping about in heavy clogs. The word entered English in the early 20th century, carrying the sense of willful disruption.