Learn what "what are you doing with a gun" means, when people say it, and how to use it naturally in English.

It is a shocked question asking why someone is holding a gun or what they are about to do.
From Undercovered Heart, Episode 16
Someone reacts with alarm after seeing another person holding a gun.
Use this in an emergency or dangerous scene when you need to react quickly. It is highly serious and not suitable for casual use.
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