oversell - definition and synonyms

verb [transitive] 

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/ˌəʊvə(r)ˈsel/
present tense
I/you/we/theyoversell
he/she/itoversells
present participleoverselling
past tenseoversold
past participleoversold
  1. to say that someone or something is better than they really are because you want to impress or persuade people