/ ˈsuːɪsaɪd; NAmE ; BrE also ˈsjuːɪ-/ noun
1.
[ U , C ] the act of killing yourself deliberately :
to commit suicide
an attempted suicide (= one in which the person survives)
a suicide letter / note (= written before sb tries to commit suicide )
a suicide bomber (= who expects to die while trying to kill other people with a bomb)
—see also assisted suicide
2.
[ U ] a course of action that is likely to ruin your career, position in society, etc. :
It would have been political suicide for him to challenge the allegations in court.
3.
[ C ] ( formal ) a person who commits suicide
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WORD ORIGIN
mid 17th cent.: from modern Latin suicida act of suicide, suicidium person who commits suicide, from Latin sui of oneself + caedere kill.