The phrase "concerted pressure" means a joint or combined effort to apply force or influence in a determined and organized way towards a particular goal or outcome. Full definition
«This is a significant victory for parliament, and follows months of concerted pressure from Labour,» he said. (theguardian.com)
Abbott and other Liberals in seats around Sydney's North Shore are under concerted pressure from the Broken Bay diocese. (theconversation.com)
If we start taking serious steps against global warming, the stage will be set for Europe and Japan to follow suit, and for concerted pressure on the rest of the world as well. (salon.com)