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1. Literally, performing a musical concert. They're one of my favorite bands, but strangely I've never seen them in concert.
2. Together; in cooperation. The two of us will need to work in concert if we're going to get through all these files. The local police department has been investigating in concert with federal agencies.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
in concert (with someone)
Fig. in cooperation with someone; with the aid of someone. Mrs. Smith planned the party in concert with her sister. In concert they planned a lovely event.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Together, jointly, as in They worked in concert on the script, or When mind is in concert with body, one can accomplish a great deal. This expression uses concert in the sense of "an agreement of two or more persons." [Early 1700s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.