met ‧ a ‧ mor ‧ phose /ˌmetəˈmɔːfəʊz $ -ˈmɔːrfoʊz/ BrE AmE verb [intransitive and transitive] formal
to change completely and become something different, or to make something change in this way ⇨ transform
metamorphose into
From an easy-going young girl, she had metamorphosed into a neurotic middle-aged woman.