Merriam-Webster's Word of the Day for June 28, 2026, is gainsay. Gainsay is a formal verb meaning to deny, disagree with, or prove false. It is typically used in negative contexts, such as "no gainsaying the evidence." The word is often seen in expressions asserting undeniable truths or facts. For example, one might say there is no gainsaying the impact of a particular cultural work. The etymology of gainsay reveals its meaning, originating from Old English. The "gain" element comes from gēan-, signifying opposition or against. This prefix was combined with the Old English verb "seyen," meaning to say. Together, these formed the Middle English "gein-seyen," evolving into the modern "gainsay." Therefore, the root meaning of gainsay is literally "to say against." This etymological insight clarifies its function as a word of contradiction or denial.