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English definition of “attest”

attest

verb    /əˈtest/
(of a person) to state with authority that something is true, or (of a situation or event) to show that something is likely to be true: [+ that clause] As one who worked there for years, I can attest that applications are carefully reviewed. [I] Her wealth was attested to by her fur coat and designer shoes.
(Definition of attest verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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