The phrase "joint brief" is correct and can be used in written English.
It refers to a written document that is prepared and presented by multiple parties, typically in a legal or professional context. Example: The lawyers submitted a joint brief to the court, outlining their arguments and evidence in support of their client's case.
The phalanx of Silicon Valley colleagues and rivals, including Microsoft, Amazon, Google, Facebook, Yahoo, Cisco and others filed a joint brief in California's central district court.
One of the plaintiffs in the joint brief, the National Cable and Telecommunications Association, said in a blogpost on Thursday that it had always supported "reasonable" net neutrality.
"The Texas statute is a reasonable means of promoting and protecting marriage -- the union of a man and a woman," the Family Research Council and Focus on the Family told the court in a joint brief.
As a writer for over 60 years on music and cricket - a unique joint brief - he was not only the journalist's journalist, but also the cricketer's journalist and the musician's journalist.
That prospect has led the players unions of all four major sports, none of which were a party to the American Needle suit, to submit a joint brief disputing the N.F.L.'s logic.
The Times Company, Time Inc. and the Newspaper Association of America put it this way in a joint brief: "The point ETW seems blind to is that the use of Mr. Woods's name or likeness in the context of artistic expression does not imply his endorsement of the art.
The ceasefire came after Mr. Mueller and Mr. McLaughlin gave a joint briefing on terrorism to President Bush.
Apart from the tech companies, seven prominent security experts and 32 law professors signed on to joint briefs on Thursday.
Mr. Giuliani shared a private hug with Senator Hillary Rodham Clinton after a joint briefing on Wednesday with the city's Congressional delegation and City Hall officials.
"Some young people have very clear reasons why they cannot live in the family home," a joint briefing by the charities from earlier this year warned.
Senior AFP and Australian Security Intelligence Organisation (Asio) officials have been repeatedly put forward by the government to attempt to quell uncertainty around the new data retention proposals, and gave a joint briefing to journalists in August.
