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Phrase(s): Shoot first, ask questions later.
Prov. Assume that everyone you encounter is hostile to you.; Take action, even though you do not know enough to be sure if it is the right action. • If the foreman saw that one of the workers was working slowly, he didn’t stop to find out if the worker was sick or unhappy; he just fired him. He believed in shooting first and asking questions later.
McGrawhill's American Idioms And Phrasal Verbs