Simple past tense and past participle of sick.(verb)
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Use "sicked" in a sentence
"But worst of all, a blear-eyed old hag, girded round with a filthy apron, and wearing wooden clogs which were not mates, dragged in an immense dog on a chain, and "sicked" him upon Eumolpus, but he beat off all attacks with his candlestick."
"Newfoundland dog - the first one in those parts, which he "sicked" onto"
"The publisher knew his public, so he gave a pound of book for every fifty cents, and crowded in plenty of wood-cuts and stamped the outside with golden bouquets and put in a steel engraving of the author, with a tissue paper veil over it, and "sicked" his multitude of broken-down clergymen, maiden ladies, grass widows, and college students on to the great American public."