gunner's coinn. a wedge of metal used to raise a cannon or mortar to the desired elevation.
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society > armed hostility > military equipment > weapon > device for discharging missiles > firearm > equipment for use with firearms > [noun] > wedge to raise or lower gun
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coin1622
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gunner's coin1779
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1779 T. ForrestVoy. New Guinea 257 The island from the S.W. appears like a wedge, or what seamen call a gunner's coin.