Which of the following words is synonymous with 'to praise highly'?

The term "laud" is synonymous with "to praise highly" because it comes from the Latin root "laudare," meaning to praise or to extol. In this context, it reflects a strong affirmation or commendation of someone’s actions or achievements. Using the word "laud" typically signifies not just basic approval, but rather a more enthusiastic or public acknowledgment of someone’s merits, accomplishments, or positive qualities.

The other options do not convey a sense of praise. For instance, "reprimand" suggests a scolding or criticism, "understate" refers to minimizing or downplaying something rather than praising it, and "disparage" means to belittle or speak negatively about someone or something, which is the opposite of offering high praise. Thus, "laud" is clearly the word that aligns with the idea of giving high praise.