Antonyms for "wind something down" would be "rev up", "accelerate", "amp up", "fire up", "gear up", "intensify", "speed up", "stimulate", or "energize". These antonyms imply an increase in activity, speed, or intensity rather than a gradual decrease. Where winding something down suggests a reduction in pace or a calming of energy, these antonyms imply the opposite. Whether it be a project, a business, or simply a day, the antonyms listed offer alternatives to the winding down process, suggesting ways to increase momentum and continue on with energy and force.