Definition of sell noun from the Oxford Advanced Learner's Dictionary

 

sell

 noun
noun
BrE BrE//sel//
 
; NAmE NAmE//sel//
 
 
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[singular] (informal) something that is not as good as it seemed to be The band only played for about half an hour—it was a real sell. see also hard sell Word Origin Old English sellan (verb), of Germanic origin; related to Old Norse selja ‘give up, sell’. Early use included the sense ‘give, hand (something) over voluntarily following a request’.
See the Oxford Advanced American Dictionary entry: sell