picket boat

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Noun1.picket boat - a boat serving as a picketpicket boat - a boat serving as a picket    
picket - a vehicle performing sentinel duty
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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Some men were passed from lifeboats to the Hogue's picket boat and steam pinnace which had been launched before the main vessel sank.
Duncan took hold of him, used approved life-saving methods, and struggled through hundreds of men, many of whom fought to attach themselves, finally landing his burden on a picket boat.
Cushing, who ended up back in the Navy when the Civil War began, commanded a 30-foot picket boat that got close enough to the Albemarle so that he was able to plant, with the help of a spar, an explosive under the enemy ship.