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Use "swivels" in a sentence
"The smaller guns were called swivels, and were mounted on upright timbers, having a pivot on which the gun traversed."
"The discharge of one of the swivels was the signal for opening fire."
"A downloadable app integrates the phone's OS and software into the head unit -- and the iPhone actually swivels horizontally and vertically -- this has to be seen to be believed!"