A “heyday” is a period when a person, career, place, or industry is at its greatest strength, popularity, or success. Related phrases include “in your prime,” “at your peak,” “at the pinnacle,” and “glory days.” The source notes that “heyday” is usually singular.
Cultural note: “Glory days” can sound nostalgic and may suggest someone is focused on the past. A city or industry can also have a heyday. The VOA article presents historical claims about the word’s earlier uses as reports from word experts and a dictionary; those accounts should remain attributed rather than stated as certain.
Keep exploringA word about a person’s best days can also describe a city, career, or industry at its height.