biàn​zhì HSK7

to deteriorate

变质 變質 biàn//zhì
to deteriorate verb
to go bad; to spoil; to become morally or ideologically degenerate; to undergo a change in nature for the worse

Did you know your milk is about to go bad?

metamorphism
the structural or chemical change in a plant part or a rock formation

Frequency

Movie subtitles
2.18 per million appears in 1% of films
Written text
5.97 per million

Details

HSK 2.0
Level 6
HSK 3.0
Level 7

Sources