concert

1 to bring about through discussion and compromise warned that the rain forests are in danger of extinction unless the world's industrial powers concert a plan to prevent such an occurrence Synonyms arrange, bargain, negotiate, concludeRelated Words settle (on or upon); chaffer, deal, dicker, haggle, horse-trade, palter; agree; contract, covenant; argue, debate, discuss, hammer out, hash (over), reason, talk, talk over, work out; renegotiate

2 to participate or assist in a joint effort to accomplish an end the governor is eager to concert with the federal authorities on this matter Synonyms band (together), collaborate, cooperate, concur, conjoin, conspire, join, league, team (up), uniteRelated Words connive; affiliate, ally, associate, combine, confederate, hang together, interface