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
cooperate, concur, coact, synergize, conduce, combine, unite one's efforts, keep together, draw together, pull together, club together, hand together, hold together, league together, band together, be banded together, pool, stand shoulder to shoulder, put shoulder to shoulder, act in concert, join forces, fraternize, cling to one another, conspire
, concert, lay one's heads together, confederate, be in league with, collude, understand one another, play into the hands of, hunt in couples, side with, take side with, go along with, go hand in hand with, join hands with, make common cause with, strike in with, unite with, join with, mix oneself up with, take part with, cast in one's lot with, join partnership, enter into partnership with, rally round, follow the lead of, come to, pass over to, come into the views of, be in the same boat, row in the same boat, sail in the same boat, sail on the same tack, be a party to, lend oneself to, chip in, participate, have a hand in, have a finger in the pie, take part in, bear part in, second, take the part of, play the game of, espouse a cause, espouse a quarrel.
concur, conduce, conspire
, contribute, agree, unite, hang together, pull together, join forces, make common cause, help to, keep pace with, run parallel, go with, go along with, go hand in hand with, coincide.