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Vinegar Hill (also Vinegar Hill Dip) is an unincorporated community in Markham, Ontario, Canada bounded by Highway 7 to the north, Highway 407 to the south, and streets just west and east of Main Street South, bordered by the Rouge River. The name of the community is believed to be linked to a cider mill on the east side of the river valley or barrel makers that filled them with vinegar to test their straightness when rolling down Markham Road.