be in cahoots with
US /bi ɪn kəˈhuːts wɪð/
UK /bi ɪn kəˈhuːts wɪð/

1.
与...串通, 与...勾结
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.
警方怀疑经理可能与窃贼串通。
•
They denied being in cahoots with the rival company.
他们否认与竞争对手公司串通。