simple past tense and past participle of concert
"The choir sang together in a concerted effort to keep perfect harmony throughout the final movement."
involving the joint activity of two or more
"concerted action"
"the conjunct influence of fire and strong wind"
"the conjunctive focus of political opposition"
"a cooperative effort"
"a united effort"
"joint military activities"
Performed through a concert of effort; done by agreement or in combination.
"The team launched a concerted campaign to raise funds for the local shelter, pooling their resources and talents to ensure its success."