decertify

Verb

decertify (third-person singular simple present decertifies, present participle decertifying, simple past and past participle decertified)

1. (transitive) To annul the certification of.
   • The American Medical Association (AMA) was formed in 1845 to gain for medical doctors a monopoly on legal licensure as health practitioners. The young AMA waged fierce (and quite successful) battles to de-certify the then-dominant natural healers — a range of herbalists, midwives, and homeopathic...1989 August 19, Bob Lederer, “Hiding Behind HIV”, in Gay Community News, volume 17, number 6, page 8
   • Nigeria was tagged as a transit-route of drug carriers. This prompted the United States government to decertify the country.2003, Patrick Keku, Tunde Akingbade, Traveler's Guide to Living in Nigeria: Security and Travel Tips
2. (transitive, industrial relations) To annul a labor union.
   • As Sallas immediately said, the 130 scabs who so easily replaced the striking printers in '85 won't be foisted upon the union--to degrade it and possibly decertify it.1988 November 11, Michael Miner, “Strike Accord at the Tribune; Is the Sun-Times Next?”, in Chicago Reader