Is using "know" instead of "find out" idiomatic here?

  • Know who did this to him and bring them to me!
  • Why do you think it might be idiomatic? Have you seen or heard the word know used as a synonym for "discover"? I can say to you Know this material, or fail the exam. But it doesn't mean "discover" or even "learn". It means "To pass the exam, you must know this material." – Tᴚoɯɐuo Jul 4 '18 at 12:10

At least to me, somehow, the word know does not show any efforts. It simply says that one should have knowledge of something. In addition, I have seldom come across a sentence that begins with 'Know' unless it's a super-informal talk.

On the other hand, find out requires your efforts to know the matter. Thus, if you want to investigate and know the truth, you better use find out over plain know.

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