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nodding donkey

noun
  1. informal (in the oil industry) a type of reciprocating pump used to extract oil from an inland well
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Word Origin

C20: so called from its shape and movement
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012