be in cahoots with
US /bi ɪn kəˈhuːts wɪð/
UK /bi ɪn kəˈhuːts wɪð/
1.
to be secretly working with someone, especially in a dishonest or illegal way
:
•
The police suspect the manager might be in cahoots with the thieves.
•
They denied being in cahoots with the rival company.