Mummify/ˈmʌmɪfaɪ/ Definition 1 of 2Pro Tip 1/3Ancient Practices Often linked to old, primarily Egyptian, traditions of preparing the dead. He studied how they used to mummify royals in ancient times. Pro Tip 2/3Not Literal Sometimes used humorously or metaphorically to mean 'very still or unchanging'. My leg fell asleep and it's totally mummified now! Pro Tip 3/3Formal Context Used in formal or historical contexts, not in everyday conversation. The museum exhibit showed how to mummify a person in ancient cultures.