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PERCH, measure. The length of sixteen feet and a half: a pole or rod of that length. Forty perches in length and four in breadth make an acre of land.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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"Not only are they experienced they are very good players who you have to somehow knock off their perch.
Little could Ferguson have imagined that 16 years later he would stand on the brink of matching the Anfield outfit, who he famously told he would "knock off their perch" when he first came south from Aberdeen.