Meaning of “suicide” - Learner’s Dictionary

suicide

noun uk us /ˈsuːɪsaɪd/
DEATH [ C, U ]

B2 the act of intentionally killing yourself:

He committed suicide after a long period of depression.
MISTAKE [ U ]

something you do that will have an extremely bad result for you:

political suicide

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