To thwart someone's plans is to?

To thwart someone's plans is to obstruct or hinder their efforts to achieve a particular goal or objective. It involves actively preventing or impeding their progress or success in some way. Thwarting can take various forms, such as creating obstacles, sabotaging their actions, or interfering with their plans. Ultimately, the goal is to disrupt their intentions and prevent them from accomplishing what they set out to do.