over·​prom·​ise | \ˌō-vər-ˈprä-məs \
overpromised; overpromising

Definition of overpromise 

: to promise more than is possible or realistic Political candidates always overpromise or else the electorate won't bother to show up at their rallies.— Michael Gomez … received sharp criticism for overpromising and underperforming.Industry Week Then a change in the Facebook algorithm punished click bait, which can tend to overpromise on what it links to. Steep traffic drops followed.— Jim Rutenberg To close a deal, bad vendors tend to overpromise features that they claim will be added down the line but never materialize.— Michael Kan

First Known Use of overpromise

1677, in the meaning defined above

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The first known use of overpromise was in 1677

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