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economy-class syndrome

noun
  1. (not in technical usage) the development of a deep-vein thrombosis in the legs or pelvis of a person travelling for a long period of time in cramped conditions
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Word Origin

C20: reference to the restricted legroom of cheaper seats on passenger aircraft
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