in cahoots (?.)

• affiliate
• affiliated
• allied
• associate
• associated
• cabalistic
• confederate
• confederated
• conspiratorial
• corporate
• coupled
• enleagued
• federate
• federated
• in collaboration
• in collusion
• in cooperation
• in league
• in partnership
• in with
• leagued
• married
• paired
• partners with
• teamed
• wed
• wedded