This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A case of leather or similar material into which a pistol fits snugly and which attaches to a belt, strap, or saddle so that it may be carried or transported.

n. A belt with loops or slots for carrying small tools or other equipment.

v. To put (a gun, for example) in a holster.

n. A case for carrying a tool, particularly a gun, safely and accessibly.

n. A belt with loops or slots for carrying small tools or other equipment.

v. To put something in a holster

n. A leather case for a pistol, carried by a horseman at the bow of his saddle, or worn on the person suspended from a belt or shoulder strap.

n. A leathern case for a pistol. Holsters were formerly, and are still sometimes, carried by horsemen or cavalrymen attached to the saddle, one on each side of the pommel; but they are now more commonly worn on the belt.

n. a belt with loops or slots for carrying small hand tools

n. a sheath (usually leather) for carrying a handgun

"Best of all for me because I always use a holster is activating the 'Lock handheld upon holstering' option."

holsters   

belt   

bolster    pollster    upholster   

sheath    pouch    scabbard    belt    backpack    strap    pistol    vest    Jeans    harness