drive a wedge between someone
US /draɪv ə wɛdʒ bɪˈtwin ˈsʌmˌwʌn/
UK /draɪv ə wɛdʒ bɪˈtwin ˈsʌmˌwʌn/

1.
离间, 制造隔阂
to cause disagreement or hostility between people
:
•
His lies began to drive a wedge between the two friends.
他的谎言开始离间这两个朋友。
•
The new policy could drive a wedge between management and employees.
新政策可能会离间管理层和员工。