"Briefing journalists" means giving them information or updates about a specific topic or event, usually in a short and concise manner. Full definition
There is no way they can know this, to the best of my knowledge arsenal do not brief journalists on transfer dealings. (justarsenal.com)
A natural consequence of some scientists being prepared to refer to those they disagree with as «deniers» when briefing journalists, perhaps. (climate-resistance.org)
Experts in vaccines and in child health came to brief journalists on the myths surrounding multiple vaccines, and whether there is real cause for parents to be concerned. (sciencemediacentre.org)