It is professional suicide to involve oneself in illegal practices.
A suicide note.
A suicide bomber.
When you slit your wrists and kill yourself, this is an example of suicide.
When you reveal that you told a big lie when running for office, this is an example of political suicide.
Other Word Forms
Origin of suicide
- Latin suī of oneself s(w)e- in Indo-European roots –cide
From American Heritage Dictionary of the English Language, 5th Edition