have been burnishing
-he estado bruñendo
Present perfect progressiveconjugation ofburnish.There are other translations for this conjugation.

burnish

In the process, the entire bourgeois media—from the right-wing pro-government [TV station] Televisa to the populist [newspaper] La Jornada—have been burnishing the credentials of Hillary Clinton.
En la coyuntura, todos los medios de comunicación burgueses —desde la derechista y oficialista Televisa hasta el populista La Jornada— han estado lustrando las credenciales de Hillary Clinton.
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