Meaning of “culprit” - Learner’s Dictionary

culprit

noun [ C ] uk us /ˈkʌlprɪt/
PERSON

someone who has done something wrong:

If caught, the culprit could face up to five years in jail.
THING

something that is responsible for a bad situation:

In many of these illnesses, stress is the main culprit.

(Definition of “culprit” from the Cambridge Learner’s Dictionary © Cambridge University Press)