Which word means to express strong disapproval of something?

The word that means to express strong disapproval is "excoriate." This term originates from the Latin word "excoriare," which literally means to strip the skin off, metaphorically alluding to a harsh criticism or censure of someone's actions or ideas. When someone excoriates a person or a practice, it implies a severe and cutting critique, often highlighting moral or ethical failures.

In contrast, "expatiate" means to speak or write at length or in detail about a subject, which does not convey a sense of disapproval. "Hallow" refers to something that is revered or made holy, and "harrow" can mean to distress or torment but does not specifically relate to expressing disapproval in a direct manner. Thus, "excoriate" is the most fitting choice for indicating strong disapproval.