overclaim

/ˌoʊvərˈkleɪm/
verb
  1. To claim something that is not true or not fully justified, especially in an exaggerated way.
    • Historians warn not to overclaim the importance of any single event in causing the war.
    • The advertisement overclaims the benefits of the product, promising instant weight loss.
    • If you overclaim your expenses, the company may audit you.
Antonyms
noun
  1. An excessive or unjustified claim.
    • His overclaim of expertise in five languages was quickly disproven.
    • The scientist's overclaim about the discovery was later retracted.
    • Insurance companies are wary of overclaims after natural disasters.