The phrase "plugged away" refers to working persistently and diligently towards a goal or task. Its antonyms include words like procrastinate, idle, waste time, and neglect. Procrastination is the act of delaying or postponing tasks, while idleness is the state of not being active or productive. Neglect refers to ignoring or failing to take care of something, while wasting time means using it in an unproductive manner. Antonyms for "plugged away" could also include words like relax, unwind, and rest since they convey the opposite notion of exerting effort or working hard.