swivel gun

noun

a gun mounted on a pedestal so that it can be turned from side to side or up and down.

First recorded in 1705–15

A port in the rail of the schooner opened and the muzzle of a small swivel-gun projected, aimed full at the launch.

There seemed to be a general wish that she would 'come on,' in spite of what was unmistakably a heavy swivel gun amidships.

Old Muzzy strictly forbidding any reply, they fired a bullet at us from a small swivel gun in the bows.

She was a swivel gun set on bearings so finely adjusted and well-greased that one man could aim her.

"Do not tremble," she said, leading her up a small circular platform on which there was a long iron swivel gun placed.

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