act in concert act together act with affiliate affiliate with align with ally amalgamate associate band band together be in cahoots be in league bracket bunch bunch up cabal cement a union centralize club club together coact coalesce collaborate collude combine come into come together concert concord concur confederate conjugate consociate consolidate conspire cooperate couple couple up creep in do business with double-harness double-team enlist enroll enter federalize federate flock to fuse gang gang up get heads together get into get together get together with go along with go in partners go in partnership go in with go into go partners go with hang together harmonize hold together hook up hook up with join join forces join fortunes with join hands with join in join together join up join up with join with keep pace with keep together league league together league with line up with make common cause marry match mate merge organize pair pair off partner play ball pull together put heads together rally round range with reciprocate run parallel to side with sign on sign up sneak in span stand in with stand together stand up with strike in with string along with swing in with take out membership take part with take sides with take up membership team 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 wed work together yoke