To accept a proposal or idea in accord with others; to reach a consensus. The union and the company have finally agreed on the terms of the new contract. Bob and Sheila are both so busy that they can't agree upon a date for the party.
See also: agree
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
agree (up)on someone or something
to agree to the choice of someone or something. Let's try to agree upon a date.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.