Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: sui 'of oneself' + English -cide

suicide

 noun
     
su‧i‧cide [uncountable and countable]
1 the act of killing yourself:
More people commit suicide at Christmas than at any other time.
My mother attempted suicide on many occasions.
He apparently left a suicide note (=letter explaining his reasons for killing himself).
 ➔ see usage note kill1
2

political/economic suicide

something you do that ruins your good position in politics or the economy:
He said a vote for Labour would be a vote for economic suicide.
3

suicide attack/mission/bombing etc

an attack etc in which the person who carries out the attack deliberately kills himself or herself in the process of killing other people
4

suicide by cop

American English an occasion when someone deliberately threatens a police officer in order to make the police officer shoot, as a way of commiting suicide
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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