The phrase "a sort of joint" is correct and usable in written English.
It can be used to describe something that resembles or functions like a joint, often in a metaphorical or informal context.
Example: "The two companies formed a sort of joint venture to collaborate on the new project."
Alternatives: "a type of partnership" or "a kind of collaboration".
Fighting against protectionism will be important for growth, and Europe and the United States can create really a sort of joint trans-Atlantic market.
Was George, then, a sort of joint cocoon for them, shaping a world secure enough to exist independent of the forces that gave them chase?
I am sure these tours are now written into every personal pension scheme; a sort of joint venture between the Norwich Union and Saga Holidays.
Yet the fact that the US and Russia assumed in Munich a sort of joint ownership of the Syrian problem could turn out to be important.
Professor Fortna argued that interim United States-Russia agreements like this week's could eventually move them into a sort of joint-mediator role.
It was one of the first times in this campaign season that a Tea Party insurgent had any sort of joint appearance with his or her Democratic opponent.
This rests largely on a confused passage in Symeon of Durham's Historia Regum Anglorum, and it has more recently been suggested that the interpretation offered by Frank Stenton that it is based on a textual error and that Óengus and Æthelbald were not associated in any sort of joint overlordship is the correct one.
She is now said to be hoping that she can at the very least meet with the other women to talk in private and then see if any sort of joint briefing can be arranged.
Why do you have a rolled up pipe of kitchen roll with four ice cubes in it, a sort of frosty joint that you're holding wet against your forehead?
Yes, there was a need a crying need, in fact, for a decent sort of joint where folks could kick back with a minimum of fuss and fear.
