What is Knuckle Duster?
1.
A brass knuckle and knife combination weapon. The Knife is built into the brass knuckle and may or may not be extended during the use of the weapon.
"That vicious motherfucker has a Knuckle Duster in each pocket; some one is going to get fucked up"
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In naval terminolgy condition "zulu-alpha" or ZA means to close up all hatches and openings to acheive water-tight and air-tig..