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Use "flatbottomed" in a sentence
"Unless he ran a flatbottomed boat for bonefish in the Keys."
"Every type of military store was amassed in profusion, Antwerp was converted into a naval arsenal, and flatbottomed boats and barges collected in every port between Ostend and Étaples."
"It was a flatbottomed outrigged deal boat, very long, and so narrow that to look over one's shoulder in it was a manoeuvre of extreme delicacy, especially where the rapids caused the water to be in wild commotion."