accord, act in concert, act together, affiliate, agree, agree with, ally, alternate, amalgamate, answer, answer to, associate, back and fill, band, band together, bandy, battledore and shuttlecock, be in league, be quits with, change, chime in with, club together, coact, coalesce, coequal, collaborate, collude, combine, come and go, come back at, commute, compensate, complement, concert, concord, concur, confederate, consolidate, conspire, cooperate, correspond, correspond to, cotton to, counter, counterchange, do business with, ebb and flow, empathize, equal, exchange, fall in with, federate, fuse, get along, get along with, get back at, get even with, get heads together, get on with, get together, give and take, give in exchange, give in return, go partners, hang together, harmonize, harmonize with, hit back at, hitch and hike, hold together, hook up, identify with, interchange, join, join in, join together, keep together, league, league together, logroll, make common cause, match, merge, partner, pass and repass, pay back, permute, play ball, pull together, put heads together, recompense, repay, requite, respond, respond to, retaliate, retort, return, return the compliment, ride and tie, seesaw, shuttle, shuttlecock, sing in chorus, stand together, strike back, swap, swing, switch, sympathize, team up, teeter-totter, teeter, throw in together, tie in, tie up, to-and-fro, trade, transpose, understand one another, unite, unite efforts, wax and wane, wibble-wabble, wigwag, work together, zigzag