Die off Definition 1 of 3Pro Tip 1/3Metaphoric Use Used metaphorically to describe the end of non-living things like trends or businesses. Fashion styles from the 80s have mostly died off. Pro Tip 2/3Non-Instant End Indicates a slow process, not sudden termination. Old technologies tend to die off as new ones emerge. Pro Tip 3/3Cultural Phenomena Can refer to the decline of cultural practices, languages, or traditions over time. Many ancient languages have died off without written records.