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

1.
與...串通, 與...勾結
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.
警方懷疑經理可能與竊賊串通。
•
They denied being in cahoots with the rival company.
他們否認與競爭對手公司串通。