to undergo a metamorphosis or significant change in form or character, often used positively for growth or evolution

to undergo radioactive decay, where an unstable element spontaneously emits radiation and transforms into a different element

of insects, crustaceans, etc., to shed the old skin or shell during growth or metamorphosis

to change for the worse; to become depraved, corrupt, or decadent; in Mainland China, this is the primary figurative sense