v. 25B6; verb
I agree with you : CONCUR, be of the same mind/opinion, see eye to eye, be in sympathy, be united, be as one man.
they had agreed to a ceasefire : CONSENT, assent, acquiesce, accept, approve, say yes, give one's approval, give the nod; formal accede.
the plan and the drawing do not agree with each other : MATCH (UP), accord, correspond, conform, coincide, fit, tally, be in harmony/agreement, be consistent/equivalent; informal square.
they agreed on a price : SETTLE, decide, arrive at, negotiate, reach an agreement, come to terms, strike a bargain, make a deal, shake hands.
differ, contradict, reject.