noun
a case for carrying a handgun or other firearm, typically made of leather or a similar material and worn on a belt or under the arm
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The police officer secured his firearm in the holster before entering the building.
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He quickly grabbed his gun from the holster and aimed at the target.
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I always feel like a cowboy when I have my holster on.
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She kept her emotions tightly in a mental holster, never letting them show.