agree (on)

contract, pledge, promise

blueprint, calculate, chart, concert, design, draft, frame, hammer out, intrigue, lay out, maneuver, map (out), plan, program (also programme), schematize, scheme, shape, square away, work out

choose, conclude, determine, figure, opt, resolve

affirm, approve, authorize, clear, confirm, OK (or okay), sanction, warrant

close, complete, end, finalize, finish, round (off or out), wind up, wrap up

bargain, deal, dicker, haggle, horse-trade, negotiate