Definition of economy class syndrome noun from the Oxford Advanced American Dictionary

 

economy class syndrome

 noun
noun
 
[uncountable]
 
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the fact of a person suffering from deep vein thrombosis after they have traveled on a plane. This condition is thought to be more common among people who travel in the cheapest seats because they do not have space to move their legs much.
See the Oxford Advanced Learner's Dictionary entry: economy class syndrome