Simple past tense and past participle of swish. (verb)
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Use "swished" in a sentence
"Again Conan's sword swished and struck, biting into the man's back through mail and skin and spine."
"Colin says he nearly got "swished" to-day, only his master begged him off because he'd done nothing at all really."
"She opened the chapel with the key she always carried, "swished" away an intrusive squirrel, left the door and window open for a moment, until the beating of frightened wings against the rafters had ceased, and, after carefully examining the floor for spiders, mice, and other creeping things, brushed away a few fallen leaves and twigs from the top of the harmonium."