If you make a concerted effort to do something, you try very hard to do it. He made a concerted effort to win me away from my steady, sweet but boring boyfriend. = concentrated. concerted effort/action/attack etc a concerted effort etc is done by people working together in a carefully planned and very determined way (concert (16-21 centuries), from concerter, from concertare, from , , from com- ( COM-) + certare )
A concerted action is done by several people or groups working together. Martin Parry, author of the report, says it's time for concerted action by world leaders
involving the joint activity of two or more; "the attack was met by the combined strength of two divisions"; "concerted action"; "the conjunct influence of fire and strong dring"; "the conjunctive focus of political opposition"; "a cooperative effort"; "a united effort"; "joint military activities"