act in concert
I
verb
act jointly, agree, be in collusion with, collude, combine, concur, connive, conspire, cooperate, federate, form a coalition, involve, join, participate, pool, unite
II
index
concur (agree), connive, conspire, cooperate, federalize (associate), federate, involve (participate), join (associate oneself with), participate, unite
Burton's Legal Thesaurus.
William C. Burton.
2006