1. (v. i.) To plot secretly; as, to conspire to commit murder\; to make an agreement, esp. a secret agreement, to do some act, as to commit treason or a crime, or to do some unlawful deed; to plot together.

2. (v. i.) To concur to one end; to agree.

3. (v. t.) To plot; to plan; to combine for.

accord act in concert act together affiliate agree ally amalgamate angle associate band band together be in cahoots be in league brew bunch bunch up cabal cement a union centralize club club together coact coadunate coalesce cogitate coincide collaborate collogue collude combine come together complot concert concoct concord concur confederate conjoin connive consociate consolidate contrive cook up cooperate correspond countermine counterplot couple devise do business with engineer federalize federate finagle finesse frame frame up fuse gang gang up get heads together get together go in partners go in partnership go partners hang together happen together harmonize hatch hatch a plot hatch up hold together hook up hook up with intrigue join join forces join fortunes with join in join together join up with join with keep together lay a plot league league together machinate make common cause maneuver marry merge operate organize pair pair off partner play ball plot pull together put heads together reciprocate rig scheme stand together stand up with synchronize synergize team up team up with team with throw in together throw in with tie in tie in with tie up tie up with unionize unite unite efforts unite with wangle wed work together