Which word best represents the act of surrounding or harassing?

The word "beleaguer" aptly describes the act of surrounding or harassing someone. It originates from a term that can be interpreted as laying siege, indicating persistent harassment or trouble. In this context, it conveys a sense of being encircled or relentlessly pressured, whether physically or metaphorically. This fits the definition accurately as it encompasses both the surrounding aspect and the notion of being persistently troubled or stressed by adversities or oppressors.

The other options do not carry the same meaning. "Plight" refers to a difficult or adverse situation, which does not imply the act of surrounding or harassing. "Dally" means to waste time or act slowly, which is unrelated to the idea of harassment or encirclement. "Pensive" describes a state of deep or serious thought, again lacking any connection to the act of surrounding or harassment. Therefore, "beleaguer" is the most appropriate word in this context.