in concert
phrase of concert
1.
acting jointly.
"we must take action in concert with our European partners"
synonyms: together, jointly, in combination, in collaboration, in cooperation, in league, shoulder to shoulder, side by side, cooperatively, concertedly; in unison
"we must take stronger action in concert with our European partners"
antonyms: alone, independently
2.
(of music or a performer) giving a public performance; live.
"they saw Pink Floyd in concert"