zero
v.— «I fired six bullets from my M4 carbine and that was the extent of my training in Kuwait. That’s how many bullets it took for me to hit the target, also known as zeroing your weapon.» —“War is hell, especially if you make public complaints about military” by Bill Katovsky San Francisco Chronicle (California) Aug. 28, 2005. (source: Double-Tongued Dictionary)
Further reading
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