변질돼요 · 변질됐어요 · 변질될 거예요 · 변질된 (+noun)
to go bad, to spoil; to be corrupted, to lose its original character
Example
여름에는 음식이 쉽게 변질되니까 냉장고에 보관하세요.
Food spoils easily in summer, so keep it in the refrigerator.
Word parts
변 change+질 quality
Literally 'change of quality' — usually for the worse.
Good to know
Figuratively: 본래 취지가 변질되다 'the original purpose gets distorted.'
Related words